Source

jqui / sass / _tabs.sass

.tab-bar, *[role="tabbed-browser"]
  position: relative
  display: block
  list-style-type: none
  left: 0
  right: 0
  top: 0
  li, *[role="tab-bar"] span
    list-style-type: none
    position: relative
    display: inline-block
    padding: 4px 8px
    border: 1px solid gray
    +rounded-border-top(3px)
    +bg-x($button-bg)
    &.active
      border-bottom-color: white
      background: white
      z-index: 2
    a
      display: block
      +button-text
      +full-width
    &:disabled
      +opacity(50)
  .tab-content, *[role="tab-content"]
    display: block
    border: 1px solid gray
    position: relative
    top: -1px
    padding: 1em 1.4em