JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

body {
    margin: 0;
}

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    background-color: #FFCCCC;
}

.content {
    background-color: #CCFFCC;
}

.footer {
    background-color: #CCCCFF;
    margin-top: auto;
}