JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="header"></div>
  <div class="content"></div>
    <div class="clear"></div>
  <div class="footer"> ddgdfgdfgfdgdf</div>
</div>

CSS

.container {
  width: 960px;
  margin: 0 auto;
  background: #eee;
  
}

.header {
  height: 200px;
  background: #cc3;
}

.content {
  width: 800px;
  height: 300px;
  float: left;
  background: #c33;
  
   
}
.clear {
    clear: both;
}

.footer {
  height: 150px;
  background: #b63;
  margin-top: -200px;
  
    
}