JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  
  <aside>
    Колонка
  </aside>

  <main>
    Контент
  </main>

</div>

CSS

.container {
  display: flex;
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
}

aside {
  flex: 0 0 25%;
  position: sticky;
  top: .5em;
  height: 100%;
}

main {
  flex: 1 1 auto;
  height: 200vh;
  background-color: #eee;
}