JSFiddle - React, Tailwind, and code Playground

HTML

<div class="line"></div>

CSS

.line {
    position: relative;
    top: 60px;
    left: 0;
    width: 80%;
    height: 10px;
    background-color: orange;
    transform: rotate(-45deg);
}
.line:after {
    content: "";
    position: absolute;
    width: 100%;
    height: 10px;
    background-color: green;
    transform: 
        rotate(90deg);
}