CSS3技巧从中心裁剪出像'V‘形状的div

<div class="v-shape"></div>

.v-shape {
  position: relative;
  width: 100px;
  height: 100px;
  background-color: #000;
}

.v-shape::before,
.v-shape::after {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
}

.v-shape::before {
  border-width: 0 50px 100px 50px;
  border-color: transparent transparent #000 transparent;
  top: 0;
  left: 0;
  transform-origin: top;
  transform: rotate(180deg);
}

.v-shape::after {
  border-width: 0 50px 100px 50px;
  border-color: transparent transparent #000 transparent;
  bottom: 0;
  right: 0;
  transform-origin: bottom;
  transform: rotate(180deg);
}