JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
  <div class="triangle tr-left"></div>
  <div class="triangle tr-right"></div>
</div>

CSS

.wrap {
  height: 200px;
  width: 100%;
  position: relative;
  background: #333;
}
.triangle {
  background: red;
  clip-path: polygon(0 40%, 0% 100%, 100% 100%);
  position: absolute;
  left: 0;
  bottom: 0;
  top: 0;
  width: 50%;
}
.triangle.tr-right {
  left: auto;
  right: 0;
  clip-path: polygon(100% 40%, 0% 100%, 100% 100%);
}