JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="sidebar">sidebar</div>
  <div class="content">content</div>
</div>

CSS

.container {
  max-width: 1170px;
  margin: 0 auto;
  border: 1px solid black;
  display: flex;
  flex-direction: row;
  position: relative;
}
.sidebar {
  background: linear-gradient(to top, #ece, #eec);
  height: 1000px;
  width: 320px;
  position: sticky;
  bottom: 0;
}
.content {
  background: #cee;
  height: 2000px;
  width: 100%;
}