buttons.css

/* BUTTONS
   -------------------------------------------------------------------------- */

button {
  display: inline-block;
  background-color: rgba(203, 203, 203, 0.38);
  color: #FFFFFF;
  padding: 6px 12px;
  margin-bottom: 0;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  user-select: none;
  border: 1px solid transparent;
  font-family: 'Source Sans Pro', 'Helvetica Neue', 'Arial', sans-serif;
}

button:focus {
  outline: 0;
}

button:hover {
  background-color: #badfff;
}

button:disabled {
  background-color: rgba(24,105,177,1);
}

button .octicon {
  padding-left: 6px;
}

.index-page .btn-primary,
.index-page .btn-secondary {
  padding: 10px;
  font-size: .8em;
}

.btn-primary {
  margin: 9px 0;
  background: #0087ff;
  color: #fff;
  border-radius: 2px;
  text-transform: inherit;
}

.btn-secondary {
  background: #8cf;
  color: #fff;
  border-radius: 2px;
}

.btn-white {
  background: #fff;
  color: #0087ff;
  border-radius: 2px;
}

.btn-outline {
  border: 1px solid #8cf;
  background: none;
  padding: 4px 13px;
  border-radius: 3px;
  color: #0087ff;
  display: inline-block;
}

.btn-light {
  background: #fff;
}

.btn-cta {
  box-shadow: 0 4px 60px rgba(0, 0, 0, .2);
}

.btn-primary:hover {
  background: #057ce7;
}

.btn-large {
  padding: 12px 17px;
  font-size: 16px;
}

.btn-small {
  padding: 8px 10px;
  font-size: 12px;
}

.border-group-left {
  border: 1px solid #0087ff;
  border-radius: 2px 0 0 2px;
  padding: 10px 14px;
}

.border-group-middle {
  border-top: 1px solid #0087ff;
  border-bottom: 1px solid #0087ff;
  padding: 10px 14px;
  margin-left: -4px;
}

.border-group-right {
  border: 1px solid #0087ff;
  border-radius: 0 2px 2px 0;
  padding: 10px 14px;
}

.border-group-right.btn {
  border: 1px solid #88CCFF;
  color: #88CCFF;
  border-left-color: #0087FF;
}

.border-group-right.btn:hover {
  border: 1px solid #0087ff;
  color: #0087ff;
  cursor: pointer;
}

.border-group-container {
  color: #0087ff;
  padding: 20px 0;
  user-select: none;
}

/* TODO there are two of these */
.lang-select {
  padding: 4px 13px;
  position: absolute;
  height: 36px;
  width: 150px;
  margin: 5px 8px;
  top: 0;
  left: 0;
  appearance: none;
  -webkit-appearance: none;
}

.lang-select:after {
  content: "";
  border: 5px solid transparent;
  /*border-top-color: #8cf;*/
  border-top-color: #A6A6A6;
  position: relative;
  left: 66px;
  top: 5px;
  pointer-events: none;
  display: inline-block;
  z-index: 10;
}