JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="UTF-8">
    <link href="Settings/Styles/Default.css" rel="stylesheet" type="text/css">
</head>
<body>
    <div class="Header">
        <h1 id="SiteName">Болтун.org</h1>
    </div>
</body>
</html>

CSS

body {
   /* background-color: #3f3f3f;*/
    background-color: aqua;
    margin: none;
    padding: none;
}

.Header {
    width: 100%;
    height: 5%;
    margin: none;
    background: linear-gradient(chartreuse, green);
    left: 0;
    top: 0;
}

SiteName {
    
}

h1, h2, h3, h4, h5, p, a {
    color: white;
}