.alert:before {
  content: '';
  position: absolute;
  width: 0;
  height: calc(100% - 44px);
  border-left: 1px solid;
  border-right: 2px solid;
  border-bottom-right-radius: 3px;
  border-top-right-radius: 3px;
  left: 0;
  top: 50%;
  transform: translate(0, -50%);
  height: 20px;
}