JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
  <div class="wrapper__main">
    MAIN
  </div>
  <div class="wrapper__bottom">
    FOOTER
  </div>
</div>

SCSS

.wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  
  &__main {
    flex-grow: 1;
    background: yellow;
  }
  
  &__bottom {
    margin-top: auto;
    background: red;
  }
}