JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container-1">
  <ul>
    <li><a href="">1</a></li>
    <li><a href="">2</a></li>
    <li><input id="koasw" type="checkbox">3</li>
    <li><a href="">4</a></li>
  </ul>
</div>

<div class="container-2">
  <div class="block n1"></div>
</div>

<div class="container-3">
  <div class="block n2"></div>
</div>

CSS

* {
  box-sizing: border-box;
}

body {
  max-width: 400px;
}
a {
  text-decoration: none;
}
.block {
  width: 30px;
  height: 30px;
  position: relative;
  background: #333;
}

.n2 {
  float: right;
}

.n1 {
  display: none;
}

/* действие после нажатия на инпут */

#koasw {
  display: none;
}

.n1 {
  display: block;
  animation: line 2s linear;
}

@keyframes line {
  from {
    left: 0;
  }
  to {
    left: 100%;
  }
}