css中带有分支的垂直线

.branch-line {
  position: relative;
  width: 2px;
  height: 200px;
  background-color: #000;
}

.branch-line::before,
.branch-line::after {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 100px;
  background-color: #000;
  transform-origin: center;
}

.branch-line::before {
  transform: rotate(45deg);
}

.branch-line::after {
  transform: rotate(-45deg);
}