JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box1"></div>
<div class="box2"></div>

CSS

body {
   border: 1px solid red;
}
.box1, .box2 {
   border: 1px solid RGB(141, 141, 141); 
   box-sizing: border-box;
   width: 66%;
   height: 60px;
   margin: 10px;
}
.box1 {
   background: RGB(254, 253, 143);
}
.box2 {
   background: RGB(246, 204, 252);
   margin-left: auto;
}