JSFiddle - React, Tailwind, and code Playground

HTML

<div class="clients">
  <div class="clients__block1"></div>
  <div class="clients__block2"></div>
</div>

CSS

* {
  box-sizing: inherit;
}

html {
  box-sizing: border-box;
}
body {
  margin: 0;
}

.clients {
display: flex;
height: 500px;
}

.clients__block1 {
width: 50%;
background: url(https://www.nastol.com.ua/pic/201610/1366x768/nastol.com.ua-190055.jpg);
background-size: cover;
}

.clients__block2 {
width: 50%;
background: red;
}