JSFiddle - React, Tailwind, and code Playground

by stic_k

HTML

<div class="wrap">
       <div class="block">
         <div class="close">
           <span></span>
           <span></span>
         </div>
       </div>
    </div>

CSS

.wrap {
  background: #aaa;
  padding: 20px;
}

.block {
  position: relative;
  width: 200px;
  height: 300px;
  background: #000;
  border-radius: 30px;
}

.block::before {
  position: absolute;
  z-index: 1;
  content: "";
  top: 0;
  right: 0;
  border: 35px solid transparent;	border-top: 35px solid #fff;   border-right: 35px solid #fff;
  border-top-right-radius: 30px;
}

.close {
  position: absolute;
  z-index: 2;
  width: 30px;
  height: 30px;
  top: 5px;
  right: 5px;
}

.close span {
  position: absolute;
  width: 90%;
  height: 5px;
  background: #000;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}

.close span:first-child {
  transform: rotate(45deg);
}

.close span:last-child {
  transform: rotate(-45deg);
}