JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

* {
    margin: 0;
    padding: 0;
}
body {
    overflow: hidden;
}
div {
    margin-top: 10px;
}
div::after {
    content: "";
    position: absolute;
    width: 100vw;
    height: 100vw;
    background: #1567A1;
    -webkit-transform: rotate(-10deg);
    background: linear-gradient(65deg, #1BB6CA 25.5%, #1567A1 25.5%, #1567A1 100%);
    margin-left: 50vw;
}
div::before {
    content: "";
    position: absolute;
    width: 100vw;
    height: 100vw;
    background: linear-gradient(45deg, #1BB6CA 85%, #1567A1 85%, #1567A1 100%);
    -webkit-transform: rotate(10deg);
    margin-left: -50vw;
}