superselector.css

.superselector-wrapper::after {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid #000;
  content: "";
  margin-left: -17px;
  vertical-align: middle;
  margin-right: 10px;
  pointer-events: none;
}
.superselector {
  box-sizing: border-box;
  vertical-align: middle;
  padding-right: 20px;
}
.superselector:focus {
  outline: 1px solid #c00;
}
.superselector-list {
  position: fixed;
  display: inline-block;
  background: #fff;
  max-height: 300px;
  box-sizing: border-box;
  border: 1px solid #666;
  border-top: 1px solid #999;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.2);
  overflow: auto;
  z-index: 10000;
  -moz-user-select: none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  -o-user-select: none;
}
.superselector-list ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}
.superselector-list ul li.choice,
.superselector-list ul li.title {
  padding: 0 6px 1px 6px;
}
.superselector-list ul li.choice.active {
  background: #1e90ff !important;
  color: #fff !important;
  cursor: pointer;
}
.superselector-list ul li.choice.disabled {
  color: #ccc;
  cursor: not-allowed !important;
}
.superselector-list ul li.seperator {
  border-top: 1px solid #aaa;
  height: 0;
  margin: 1px 0;
}
.superselector-list ul li.title {
  font-weight: bold;
  background: #ddd;
  font-size: 1.1em;
  padding: 2px auto;
  margin-top: 5px;
  border-top: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
}