css选中样式

选中样式

div {
  cursor: pointer;
  display: flex;
  width: 600px;
  height: 20px;
  line-height: 20px;
  border: 3px solid #2b89fd;
}

div::before {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  border: 12px solid #2b89fd;
  border-top-color: transparent;
  border-left-color: transparent;
}

div::after {
  content: "";
  display: block;
  width: 5px;
  height: 10px;
  position: absolute;
  right: 4px;
  bottom: 4px;
  border: 1px solid #fff;
  transform: rotate(45deg);
  cursor: pointer;
}