How do I make rounded button-group in Foundation 6? - zurb-foundation

Question

There used to be a "round" class on Foundation 5 that transforms a button-group to have rounded edges. How do I do this in Foundation 6?

Answer 1

It's not possible in Foundation 6. The rules have been completely removed along with others to reduce the file size. Your best bet is to copy the rules into the Foundation 6 css file or into a custom css file (it's up to you).
Here are the css rules you'll need (taken directly from the latest Foundation 5 file, with no alterations):
.button-group {
list-style: none;
margin: 0;
left: 0; }
.button-group:before, .button-group:after {
content: " ";
display: table; }
.button-group:after {
clear: both; }
.button-group.even-2 li {
display: inline-block;
margin: 0 -2px;
width: 50%; }
.button-group.even-2 li > button, .button-group.even-2 li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.even-2 li:first-child button, .button-group.even-2 li:first-child .button {
border-left: 0; }
.button-group.even-2 li button, .button-group.even-2 li .button {
width: 100%; }
.button-group.even-3 li {
display: inline-block;
margin: 0 -2px;
width: 33.33333%; }
.button-group.even-3 li > button, .button-group.even-3 li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.even-3 li:first-child button, .button-group.even-3 li:first-child .button {
border-left: 0; }
.button-group.even-3 li button, .button-group.even-3 li .button {
width: 100%; }
.button-group.even-4 li {
display: inline-block;
margin: 0 -2px;
width: 25%; }
.button-group.even-4 li > button, .button-group.even-4 li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.even-4 li:first-child button, .button-group.even-4 li:first-child .button {
border-left: 0; }
.button-group.even-4 li button, .button-group.even-4 li .button {
width: 100%; }
.button-group.even-5 li {
display: inline-block;
margin: 0 -2px;
width: 20%; }
.button-group.even-5 li > button, .button-group.even-5 li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.even-5 li:first-child button, .button-group.even-5 li:first-child .button {
border-left: 0; }
.button-group.even-5 li button, .button-group.even-5 li .button {
width: 100%; }
.button-group.even-6 li {
display: inline-block;
margin: 0 -2px;
width: 16.66667%; }
.button-group.even-6 li > button, .button-group.even-6 li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.even-6 li:first-child button, .button-group.even-6 li:first-child .button {
border-left: 0; }
.button-group.even-6 li button, .button-group.even-6 li .button {
width: 100%; }
.button-group.even-7 li {
display: inline-block;
margin: 0 -2px;
width: 14.28571%; }
.button-group.even-7 li > button, .button-group.even-7 li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.even-7 li:first-child button, .button-group.even-7 li:first-child .button {
border-left: 0; }
.button-group.even-7 li button, .button-group.even-7 li .button {
width: 100%; }
.button-group.even-8 li {
display: inline-block;
margin: 0 -2px;
width: 12.5%; }
.button-group.even-8 li > button, .button-group.even-8 li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.even-8 li:first-child button, .button-group.even-8 li:first-child .button {
border-left: 0; }
.button-group.even-8 li button, .button-group.even-8 li .button {
width: 100%; }
.button-group > li {
display: inline-block;
margin: 0 -2px; }
.button-group > li > button, .button-group > li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group > li:first-child button, .button-group > li:first-child .button {
border-left: 0; }
.button-group.stack > li {
display: block;
margin: 0;
float: none; }
.button-group.stack > li > button, .button-group.stack > li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.stack > li:first-child button, .button-group.stack > li:first-child .button {
border-left: 0; }
.button-group.stack > li > button, .button-group.stack > li .button {
border-color: rgba(255, 255, 255, 0.5);
border-left-width: 0;
border-top: 1px solid;
display: block;
margin: 0; }
.button-group.stack > li > button {
width: 100%; }
.button-group.stack > li:first-child button, .button-group.stack > li:first-child .button {
border-top: 0; }
.button-group.stack-for-small > li {
display: inline-block;
margin: 0 -2px; }
.button-group.stack-for-small > li > button, .button-group.stack-for-small > li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.stack-for-small > li:first-child button, .button-group.stack-for-small > li:first-child .button {
border-left: 0; }
#media only screen and (max-width: 40em) {
.button-group.stack-for-small > li {
display: block;
margin: 0;
width: 100%; }
.button-group.stack-for-small > li > button, .button-group.stack-for-small > li .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.stack-for-small > li:first-child button, .button-group.stack-for-small > li:first-child .button {
border-left: 0; }
.button-group.stack-for-small > li > button, .button-group.stack-for-small > li .button {
border-color: rgba(255, 255, 255, 0.5);
border-left-width: 0;
border-top: 1px solid;
display: block;
margin: 0; }
.button-group.stack-for-small > li > button {
width: 100%; }
.button-group.stack-for-small > li:first-child button, .button-group.stack-for-small > li:first-child .button {
border-top: 0; } }
.button-group.radius > * {
display: inline-block;
margin: 0 -2px; }
.button-group.radius > * > button, .button-group.radius > * .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.radius > *:first-child button, .button-group.radius > *:first-child .button {
border-left: 0; }
.button-group.radius > *,
.button-group.radius > * > a,
.button-group.radius > * > button,
.button-group.radius > * > .button {
border-radius: 0; }
.button-group.radius > *:first-child, .button-group.radius > *:first-child > a, .button-group.radius > *:first-child > button, .button-group.radius > *:first-child > .button {
-webkit-border-bottom-left-radius: 3px;
-webkit-border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
border-top-left-radius: 3px; }
.button-group.radius > *:last-child, .button-group.radius > *:last-child > a, .button-group.radius > *:last-child > button, .button-group.radius > *:last-child > .button {
-webkit-border-bottom-right-radius: 3px;
-webkit-border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
border-top-right-radius: 3px; }
.button-group.radius.stack > * {
display: block;
margin: 0; }
.button-group.radius.stack > * > button, .button-group.radius.stack > * .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.radius.stack > *:first-child button, .button-group.radius.stack > *:first-child .button {
border-left: 0; }
.button-group.radius.stack > * > button, .button-group.radius.stack > * .button {
border-color: rgba(255, 255, 255, 0.5);
border-left-width: 0;
border-top: 1px solid;
display: block;
margin: 0; }
.button-group.radius.stack > * > button {
width: 100%; }
.button-group.radius.stack > *:first-child button, .button-group.radius.stack > *:first-child .button {
border-top: 0; }
.button-group.radius.stack > *,
.button-group.radius.stack > * > a,
.button-group.radius.stack > * > button,
.button-group.radius.stack > * > .button {
border-radius: 0; }
.button-group.radius.stack > *:first-child, .button-group.radius.stack > *:first-child > a, .button-group.radius.stack > *:first-child > button, .button-group.radius.stack > *:first-child > .button {
-webkit-top-left-radius: 3px;
-webkit-top-right-radius: 3px;
border-top-left-radius: 3px;
border-top-right-radius: 3px; }
.button-group.radius.stack > *:last-child, .button-group.radius.stack > *:last-child > a, .button-group.radius.stack > *:last-child > button, .button-group.radius.stack > *:last-child > .button {
-webkit-bottom-left-radius: 3px;
-webkit-bottom-right-radius: 3px;
border-bottom-left-radius: 3px;
border-bottom-right-radius: 3px; }
#media only screen and (min-width: 40.0625em) {
.button-group.radius.stack-for-small > * {
display: inline-block;
margin: 0 -2px; }
.button-group.radius.stack-for-small > * > button, .button-group.radius.stack-for-small > * .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.radius.stack-for-small > *:first-child button, .button-group.radius.stack-for-small > *:first-child .button {
border-left: 0; }
.button-group.radius.stack-for-small > *,
.button-group.radius.stack-for-small > * > a,
.button-group.radius.stack-for-small > * > button,
.button-group.radius.stack-for-small > * > .button {
border-radius: 0; }
.button-group.radius.stack-for-small > *:first-child, .button-group.radius.stack-for-small > *:first-child > a, .button-group.radius.stack-for-small > *:first-child > button, .button-group.radius.stack-for-small > *:first-child > .button {
-webkit-border-bottom-left-radius: 3px;
-webkit-border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
border-top-left-radius: 3px; }
.button-group.radius.stack-for-small > *:last-child, .button-group.radius.stack-for-small > *:last-child > a, .button-group.radius.stack-for-small > *:last-child > button, .button-group.radius.stack-for-small > *:last-child > .button {
-webkit-border-bottom-right-radius: 3px;
-webkit-border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
border-top-right-radius: 3px; } }
#media only screen and (max-width: 40em) {
.button-group.radius.stack-for-small > * {
display: block;
margin: 0; }
.button-group.radius.stack-for-small > * > button, .button-group.radius.stack-for-small > * .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.radius.stack-for-small > *:first-child button, .button-group.radius.stack-for-small > *:first-child .button {
border-left: 0; }
.button-group.radius.stack-for-small > * > button, .button-group.radius.stack-for-small > * .button {
border-color: rgba(255, 255, 255, 0.5);
border-left-width: 0;
border-top: 1px solid;
display: block;
margin: 0; }
.button-group.radius.stack-for-small > * > button {
width: 100%; }
.button-group.radius.stack-for-small > *:first-child button, .button-group.radius.stack-for-small > *:first-child .button {
border-top: 0; }
.button-group.radius.stack-for-small > *,
.button-group.radius.stack-for-small > * > a,
.button-group.radius.stack-for-small > * > button,
.button-group.radius.stack-for-small > * > .button {
border-radius: 0; }
.button-group.radius.stack-for-small > *:first-child, .button-group.radius.stack-for-small > *:first-child > a, .button-group.radius.stack-for-small > *:first-child > button, .button-group.radius.stack-for-small > *:first-child > .button {
-webkit-top-left-radius: 3px;
-webkit-top-right-radius: 3px;
border-top-left-radius: 3px;
border-top-right-radius: 3px; }
.button-group.radius.stack-for-small > *:last-child, .button-group.radius.stack-for-small > *:last-child > a, .button-group.radius.stack-for-small > *:last-child > button, .button-group.radius.stack-for-small > *:last-child > .button {
-webkit-bottom-left-radius: 3px;
-webkit-bottom-right-radius: 3px;
border-bottom-left-radius: 3px;
border-bottom-right-radius: 3px; } }
.button-group.round > * {
display: inline-block;
margin: 0 -2px; }
.button-group.round > * > button, .button-group.round > * .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.round > *:first-child button, .button-group.round > *:first-child .button {
border-left: 0; }
.button-group.round > *,
.button-group.round > * > a,
.button-group.round > * > button,
.button-group.round > * > .button {
border-radius: 0; }
.button-group.round > *:first-child, .button-group.round > *:first-child > a, .button-group.round > *:first-child > button, .button-group.round > *:first-child > .button {
-webkit-border-bottom-left-radius: 1000px;
-webkit-border-top-left-radius: 1000px;
border-bottom-left-radius: 1000px;
border-top-left-radius: 1000px; }
.button-group.round > *:last-child, .button-group.round > *:last-child > a, .button-group.round > *:last-child > button, .button-group.round > *:last-child > .button {
-webkit-border-bottom-right-radius: 1000px;
-webkit-border-top-right-radius: 1000px;
border-bottom-right-radius: 1000px;
border-top-right-radius: 1000px; }
.button-group.round.stack > * {
display: block;
margin: 0; }
.button-group.round.stack > * > button, .button-group.round.stack > * .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.round.stack > *:first-child button, .button-group.round.stack > *:first-child .button {
border-left: 0; }
.button-group.round.stack > * > button, .button-group.round.stack > * .button {
border-color: rgba(255, 255, 255, 0.5);
border-left-width: 0;
border-top: 1px solid;
display: block;
margin: 0; }
.button-group.round.stack > * > button {
width: 100%; }
.button-group.round.stack > *:first-child button, .button-group.round.stack > *:first-child .button {
border-top: 0; }
.button-group.round.stack > *,
.button-group.round.stack > * > a,
.button-group.round.stack > * > button,
.button-group.round.stack > * > .button {
border-radius: 0; }
.button-group.round.stack > *:first-child, .button-group.round.stack > *:first-child > a, .button-group.round.stack > *:first-child > button, .button-group.round.stack > *:first-child > .button {
-webkit-top-left-radius: 1rem;
-webkit-top-right-radius: 1rem;
border-top-left-radius: 1rem;
border-top-right-radius: 1rem; }
.button-group.round.stack > *:last-child, .button-group.round.stack > *:last-child > a, .button-group.round.stack > *:last-child > button, .button-group.round.stack > *:last-child > .button {
-webkit-bottom-left-radius: 1rem;
-webkit-bottom-right-radius: 1rem;
border-bottom-left-radius: 1rem;
border-bottom-right-radius: 1rem; }
#media only screen and (min-width: 40.0625em) {
.button-group.round.stack-for-small > * {
display: inline-block;
margin: 0 -2px; }
.button-group.round.stack-for-small > * > button, .button-group.round.stack-for-small > * .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.round.stack-for-small > *:first-child button, .button-group.round.stack-for-small > *:first-child .button {
border-left: 0; }
.button-group.round.stack-for-small > *,
.button-group.round.stack-for-small > * > a,
.button-group.round.stack-for-small > * > button,
.button-group.round.stack-for-small > * > .button {
border-radius: 0; }
.button-group.round.stack-for-small > *:first-child, .button-group.round.stack-for-small > *:first-child > a, .button-group.round.stack-for-small > *:first-child > button, .button-group.round.stack-for-small > *:first-child > .button {
-webkit-border-bottom-left-radius: 1000px;
-webkit-border-top-left-radius: 1000px;
border-bottom-left-radius: 1000px;
border-top-left-radius: 1000px; }
.button-group.round.stack-for-small > *:last-child, .button-group.round.stack-for-small > *:last-child > a, .button-group.round.stack-for-small > *:last-child > button, .button-group.round.stack-for-small > *:last-child > .button {
-webkit-border-bottom-right-radius: 1000px;
-webkit-border-top-right-radius: 1000px;
border-bottom-right-radius: 1000px;
border-top-right-radius: 1000px; } }
#media only screen and (max-width: 40em) {
.button-group.round.stack-for-small > * {
display: block;
margin: 0; }
.button-group.round.stack-for-small > * > button, .button-group.round.stack-for-small > * .button {
border-left: 1px solid;
border-color: rgba(255, 255, 255, 0.5); }
.button-group.round.stack-for-small > *:first-child button, .button-group.round.stack-for-small > *:first-child .button {
border-left: 0; }
.button-group.round.stack-for-small > * > button, .button-group.round.stack-for-small > * .button {
border-color: rgba(255, 255, 255, 0.5);
border-left-width: 0;
border-top: 1px solid;
display: block;
margin: 0; }
.button-group.round.stack-for-small > * > button {
width: 100%; }
.button-group.round.stack-for-small > *:first-child button, .button-group.round.stack-for-small > *:first-child .button {
border-top: 0; }
.button-group.round.stack-for-small > *,
.button-group.round.stack-for-small > * > a,
.button-group.round.stack-for-small > * > button,
.button-group.round.stack-for-small > * > .button {
border-radius: 0; }
.button-group.round.stack-for-small > *:first-child, .button-group.round.stack-for-small > *:first-child > a, .button-group.round.stack-for-small > *:first-child > button, .button-group.round.stack-for-small > *:first-child > .button {
-webkit-top-left-radius: 1rem;
-webkit-top-right-radius: 1rem;
border-top-left-radius: 1rem;
border-top-right-radius: 1rem; }
.button-group.round.stack-for-small > *:last-child, .button-group.round.stack-for-small > *:last-child > a, .button-group.round.stack-for-small > *:last-child > button, .button-group.round.stack-for-small > *:last-child > .button {
-webkit-bottom-left-radius: 1rem;
-webkit-bottom-right-radius: 1rem;
border-bottom-left-radius: 1rem;
border-bottom-right-radius: 1rem; } }
.button-bar:before, .button-bar:after {
content: " ";
display: table; }
.button-bar:after {
clear: both; }
.button-bar .button-group {
float: left;
margin-right: 0.625rem; }
.button-bar .button-group div {
overflow: hidden; }
Foundation 6 Fiddle

Answer 2

Rounded button-group is essentially rounding of of the first and last buttons on the left and on the right, respectively.
HTML:
<div class="button-group">
<a class="button first">First</a>
<a class="button">Middle</a>
<a class="button last">Last</a>
</div>
SCSS:
#mixin radius-left($radius) {
border-radius-topleft: $radius;
border-radius-bottomleft: $radius;
-moz-border-radius-topleft: $radius;
-moz-border-radius-bottomleft: $radius;
-webkit-border-top-left-radius: $radius;
-webkit-border-bottom-left-radius: $radius;
-khtml-border-top-left-radius: $radius;
-khtml-border-bottom-left-radius: $radius;
}
#mixin radius-right($radius) {
border-radius-topright: $radius;
border-radius-bottomright: $radius;
-moz-border-radius-topright: $radius;
-moz-border-radius-bottomright: $radius;
-webkit-border-top-right-radius: $radius;
-webkit-border-bottom-right-radius: $radius;
-khtml-border-top-right-radius: $radius;
-khtml-border-bottom-right-radius: $radius;
}
..
..
.button.first { #include radius-left(10px); }
.button.last { #include radius-right(10px); }
Just a few easy to understand lines providing complete control over the rounding.