Add list of buttons

sass/elements/button.sass

@@ -199,3 +199,43 @@ $button-static-border-color: $grey-lighter !default
     color: $button-static-color
     box-shadow: none
     pointer-events: none
+
+.buttons
+  align-items: center
+  display: flex
+  flex-wrap: wrap
+  justify-content: flex-start
+  .button
+    margin-bottom: 0.5rem
+    &:not(:last-child)
+      margin-right: 0.5rem
+  &:last-child
+    margin-bottom: -0.5rem
+  &:not(:last-child)
+    margin-bottom: 1rem
+  &.has-addons
+    .button
+      &:not(:first-child)
+        border-bottom-left-radius: 0
+        border-top-left-radius: 0
+      &:not(:last-child)
+        border-bottom-right-radius: 0
+        border-top-right-radius: 0
+        margin-right: -1px
+      &:last-child
+        margin-right: 0
+      &:hover,
+      &.is-hovered
+        z-index: 2
+      &:focus,
+      &.is-focused,
+      &:active,
+      &.is-active,
+      &.is-selected
+        z-index: 3
+        &:hover
+          z-index: 4
+  &.is-centered
+    justify-content: center
+  &.is-right
+    justify-content: flex-end