JSFiddle - React, Tailwind, and code Playground

by Felis Catus

HTML

<div class="knot">
</div>

SCSS

body {
  background-color: #333;
}
.knot {
  position: fixed;
  top: 100px;
  left: 100px;
  width: 100px;
  height: 10px;
  background-color: #badbee;
  box-shadow: 0 15px 0 0 #badbee;
  z-index: 0;
  &:after{
    content: '';
    width: 10px;
    height: 100px;
    left: 37px;
    top: -37px;
    background-color: #deadbf;
    position: absolute;
    z-index: -1;
    box-shadow: 15px 0 0 0 #deadbf;
  }
}