JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="header">header</div>
    <div class="main">aasdasd</div>
    <div class="footer">footer</div>
</div>

CSS

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

.container {
  min-height: 100%;
  background-color: gray;
  max-width: 200px;
  margin: 0 auto;
  position: relative;
  padding-bottom: 90px;
  
}

.header {
  height: 60px;
  background-color: green;
}

.footer {
  height: 90px;
  background-color: red;
  position: absolute;
  width: 100%;
  bottom: 0;
}