JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <div class="wrap">
    <div class="sidebar">*</div>
    <div class="main">*</div>
  </div>
</body>

CSS

.sidebar {
  width: 214px;
  height: 100vh;
  display: inline-block;
  float: left;
  background-color: red;
  position:absolute;
}

.main {
  width: 100%;
  height: 100vh;
  float: left;
  background-color: blue;
}