.rf-combobox {
  display: inline-block;
  position: relative;
}

.rf-combobox-list {
  display: none;
  position: absolute;
  z-index: 1;
  border: 1px solid #aaa;
  background: #fff;
  top: 100%;
  padding: 5px 0px;
  max-height: 400px;
  overflow: auto;
  font-size: 12px;
  font-family: sans-serif;
  width: 100%;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  box-sizing: border-box;
}

.rf-combobox-is-open .rf-combobox-list {
  display: block;
}

.rf-combobox-option:focus {
  outline: 0;
  color: white;
  background: hsl(200, 50%, 50%);
}

.rf-combobox-input {
  padding-right: 20px;
  width: 100%;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  box-sizing: border-box;
}

.rf-combobox-button {
  display: inline-block;
  position: absolute;
  cursor: default;
  outline: none;
  top: 2px;
  right: 6px;
  font-size: 14px;
  cursor: default;
}

.rf-combobox-button:active {
  color: #4095BF;
}

.rf-combobox-option {
  display: block;
  padding: 2px 16px;
  cursor: default;
}

.rf-combobox-selected:before {
  content: '✓';
  position: absolute;
  left: 4px;
}