JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer-one">
  <div class="form-block">
    <div class="block-one"></div>
    <div class="block-two"></div>
    <div class="block-three"></div>
    <div class="block-four"></div>
  </div>
  
  <div class="image-block"></div>
</div>

CSS

.outer-one
{
  width:90%;
  background-color:green;
  float:left;
  height:500px;
  padding:10px;
}

.form-block
{
  height:100px;
  background-color:white;
  padding:10px;
  float:left;
  width:100%;
}

.block-one,
.block-two,
.block-three,
.block-four
{
  height:100px;
  width:25%;
  float:left;
}

.block-one
{
  background-color:yellow;
}

.block-two
{
  background-color:pink;
}

.block-three
{
  background-color:red;
}

.block-four
{
  background-color:blue;
}

.image-block
{
  height:300px;
  background-color:black;
}