JSFiddle - React, Tailwind, and code Playground

HTML

<div id="equipe1"></div>

CSS

body { background:#1a1a1a; }

#equipe1 {
	background: #262626;
	width: 564px;
	height: 121px;
	left: 0;
	top: 57px;
	position: absolute;
	box-shadow: 0 0 4px 0 #0c0c0c;
}
#equipe1:before {
    content: '';
    position: absolute;
    top: 0;
	right: 0;
    border-top: 130px solid #1a1a1a;
    border-left: 130px solid rgba(0,0,0,0);
    width: 0;
}