JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="header">
      <div class="header_content">
      </div>
    </div>
    <div class="content">
      <div class="main">hhh
      </div>
      <div class="footer">hhh
      </div>
    </div>
  </body>
</html>

CSS

html, body {
height: 100%;
max-width: 100%;
}
body {
margin: 0 auto;
padding: 0;
background-color: #F1F1F1;
font-family: Times New Roman;
font-size: 12px;
color: #000;
}
.header {
background-color: #888;
height: 160px;
}
.header_content {
width: 740px;
height: 100%;
background-color: #104E8B;
margin: 0 auto;
}
.content {
width: 740px;
margin: 0 auto;
border: 1px solid #FFF;
height: 100%;
}
.main {
background-color: #fff;
min-height: 100%;
}
.footer {
background-color: #000;
color: #FFF;
height: 60px;
}