.model-box {
  position: relative;
  line-height: inherit;
  background-color: #fff;
}
.model-box .model-select-text {
  position: relative;
  width: 100%;
  cursor: pointer;
  user-select: none;
}
.model-box .model-select-text:after {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  content: '';
  width: 0;
  height: 0;
  border-width: 10px 8px 0;
  border-style: solid;
  border-color: #666 transparent transparent;
}
.model-box .model-select-option {
  position: absolute;
  top: 0;
  bottom: auto;
  left: 0;
  display: none;
  list-style: none;
  border: 1px solid #e4e4e4;
  border-top: none;
  padding: 0;
  margin: 0;
  width: 100%;
  z-index: 99;
  background-color: #fff;
  transform: translateY(3rem);
  -webkit-transform: translateY(3rem);
  -moz-transform: translateY(3rem);
  -ms-transform: translateY(3rem);
}
.model-box .model-select-option li {
  height: 28px;
  line-height: 28px;
  color: #333;
  font-size: 14px;
  margin: 0;
  padding: 0;
  cursor: pointer;
  text-indent: 1em;
}
.model-box .model-select-option li:hover {
  background-color: #f3f3f3;
}
.model-box .model-select-option li.seleced {
  background-color: #f3f3f3;
}