radon-select/examples/style.css

.radon-select {
  position: relative;
  display: inline-block;
  box-sizing: border-box;
  height: 30px;
  vertical-align: middle;
  color: #666;
}

.radon-select-list {
  min-width: 110px;
  position: absolute;
  border: 1px solid lightblue;
  background: #fff;
  z-index: 200;
}

.radon-select-current {
  padding: 5px 10px;
  width: 100%;
  box-sizing: border-box;
  border: 1px solid #ccc;
  overflow: hidden;
  white-space: nowrap;
  cursor: pointer;
  outline: none;
}

.radon-select-current:after {
  content: "";
  position: absolute;
  right: 15px;
  top: 50%;
  display: inline-block;
  width: 0;
  height: 0;
  margin: -2px 0 0 5px;
  border: 4px solid transparent;
  border-top-color: #666;
  vertical-align: middle;
}

.radon-select.open .radon-select-current {
  display: none;
}

.radon-select.focus .radon-select-current {
  border-color: blue;
}

.radon-select-option {
  padding: 5px 40px 5px 10px;
  border-top: 1px solid #ccc;
  outline: none;
}

.radon-select-option:first-child {
  border-top: none;
}

.radon-select-option.active {
  color: blue;
}

.radon-select-option.hover {
  color: lightblue;
}

.radon-select-hidden-select {
  /* hide the select box visually */
  position: absolute!important;
  overflow: hidden!important;
  display: block!important;
  width: 1px!important;
  height: 1px!important;
  margin: -1px!important;
  padding: 0!important;
  border: 0!important;
  clip: rect(0 0 0 0)!important;
}