JSFiddle - React, Tailwind, and code Playground
HTML
<html>
<body>
<div id="bloque_1" style="height:80%;background:red;width:100%;">
</div>
</body>
</html>
CSS
html, body { height: 100%; width: 100%; margin: 0;background: #3c3c3c }
<html>
<body>
<div id="bloque_1" style="height:80%;background:red;width:100%;">
</div>
</body>
</html>
html, body { height: 100%; width: 100%; margin: 0;background: #3c3c3c }