static/css/zamboni/tabs.css

.tab-wrapper {
    background-color: #b5d9e5;
    border: 4px solid #b5d9e5;
    position: relative;
    margin-top: 3em;
    -moz-border-radius: 5px;
    -webkit-border-radius: 5px;
    border-radius: 5px;
}

.tab-wrapper form {
    margin-bottom: 0;
}

.tab-wrapper fieldset {
    margin: 1em;
}

.tab-wrapper .tab-nav {
    position: absolute;
    top: -1.85em;
    left: 1em;
    margin: 0;
}

.tab-wrapper .tab-nav li {
    margin: 0 .3em 0 0;
    display: inline;
}

.html-rtl .tab-wrapper .tab-nav {
    left: auto;
    right: 1em;
}

.tab-wrapper .tab-nav a {
      color: #235;
      font-weight: bold;
      font-size: 12px;
      background: #b5d9e5;
      border: 0;
      padding: .5em 12px;
      -moz-border-radius: 5px 5px 0 0;
}

.tab-wrapper .tab-nav .tab-selected a {
      color: #fff;
      background: #2e5186;
      border-bottom: 0;
}

.tab-wrapper .tab-panel {
    display: none;
    border: 1px solid #2e5186;
    -moz-border-radius: 3px;
    -webkit-border-radius: 3px;
    border-radius: 3px;
    background: #fff;
}

.tab-wrapper .tab-panel.tab-selected {
    display: block;
}

.tab-wrapper .fm-control {
    font-weight: bold;
    border-top: 1px solid #a5bfce;
    margin-top: -1px;
    position: relative;
    z-index: 10;
    overflow: hidden;
    padding: 0.3em 1em 0.5em;
    -webkit-border-bottom-right-radius: 3px;
    -webkit-border-bottom-left-radius: 3px;
    -moz-border-radius: 0 0 3px 3px;
    border-radius: 0 0 3px 3px;
}