JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="circle1"></div>
  <div class="circle2"></div>
  <div class="circle3"></div>
  <div class="circle4"></div>
  <div class="circle5"></div>
  <div class="circle6"></div>
  <div class="circle7"></div>
  <div class="circle8"></div>
  <div class="circle9"></div>
</div>

CSS

.container {
  width: 50vw;
  margin: auto;
}

.container > div {
  border-radius: 50%;
  float: left;
  width: 33.333%;
  padding-top: 33.333%;
}

.circle1 {background-color: black;}
.circle2 {background-color: darkred;}
.circle3 {background-color: gold;}
.circle4 {background-color: greenyellow;}
.circle5 {background-color: blueviolet;}
.circle6 {background-color: deeppink;}
.circle7 {background-color: blue;}
.circle8 {background-color: aqua;}
.circle9 {background-color: darkorange;}