JSFiddle - React, Tailwind, and code Playground

HTML

<div class="clearfix wrap">
   <div class="sidebar_left"></div>
   <div class="content"></div>
   <div class="sidebar_right"></div>
</div>

CSS

div {
  background:#ddd;
  height:100px;
}
.wrap {
  position: relative;
}
.sidebar_left {
  width: 200px;
  position: absolute;
  left:0;
  top:0;
}

.sidebar_right {
  position: absolute;
  width: 100px;
  right:0;
  top:0;
}

.content {
  margin-right: 100px;
  margin-left: 200px;
  padding: 0 30px; /* для отступов между колонками */
  background:#ccc;
}