JSFiddle - React, Tailwind, and code Playground

by Christian Sonne

HTML

<ul id="ballpit">
  <li id="red"></li>
  <li id="green"></li>
  <li id="blue"></li>
  <li id="orange"></li>
  <li id="rebeccapurple"></li>
</ul>

SCSS

:root {
  --animation-duration: 0.3s;
}

ul {
  margin: 50px;
  list-style: none;
}

li {
  margin: 0;
  padding: 0;
  position: absolute;
  width: 20px;
  height: 20px;
  transition: transform var(--animation-duration) ease-out;
}

li:before {
  content: "";
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: currentColor;
}

li.up:before {
  animation: bounceup calc(var(--animation-duration) / 2) alternate 2 cubic-bezier(0.165, 0.84, 0.44, 1);
}

li.down:before {
  animation: bouncedown calc(var(--animation-duration) / 2) alternate 2 cubic-bezier(0.165, 0.84, 0.44, 1);
}

@keyframes bounceup {
  to {
    transform: translateY(-20px);
  }
}

@keyframes bouncedown {
  to {
    transform: translateY(20px);
  }
}

#red {
  color: red;
}

#green {
  color: green;
}

#blue {
  color: blue;
}

#orange {
  color: orange;
}

#rebeccapurple {
  color: rebeccapurple;
}

@for $i from 1 through 10 {
  li:nth-child(#{$i}) {
    transform: translateX(calc(25px * #{$i}))
  }
}

JavaScript

ballpit.addEventListener("click", function(e) {
	if (e.target.nodeName !== "LI") return;
	let prev = document.querySelector("li.selected") || document.querySelector("li");
  let next = e.target;
  let tmp = prev.style.transform || window.getComputedStyle(prev).transform;
  prev.style.transform = next.style.transform || window.getComputedStyle(next).transform;
  next.style.transform = tmp;
  prev.classList.add("down");
  prev.classList.remove("up", "selected");
  next.classList.add("selected", "up");
  next.classList.remove("down");
  
})