JSFiddle - React, Tailwind, and code Playground

HTML

<div class="one"></div>

CSS

.one {
    height: 200px;    
    background: blue;
    position: relative;
    
}
.one:after {
    display: block;
    content: "";    
    width: 100%;
    height: 40px;
    background: white;
    bottom: 0;
    left: 0;
    position: absolute;
    -webkit-clip-path: polygon(0 100%, 100% 0, 100% 100%, 0 100%);
}