JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
  <div class="space"></div>
  <div class="page">
    Основное содержание.
  </div>
  <div class="space"></div>
</div>

CSS

.wrap {}

.space {
  float: left;
  min-height: 1px;
  width: 5%;
  background: red;
}

.page {
  float: left;
  width: 90%;
  background: yellow;
}