.elementzx {
	letter-spacing: 0.666rem;
}
.elementzx span:nth-child(1) {
  background: red;
}
.elementzx span:nth-child(2) {
  background: yellow;
}
.elementzx span:nth-child(3) {
  background: lightgreen;
}
.elementzx span:nth-child(4) {
  background: cyan;
}

@media screen and (min-width: 640px){
	ul {
		columns: 2 auto;
		gap: 1rem;
		border-bottom: 2px solid #CCC;
		margin-bottom: 2rem;
		padding-bottom: 2rem;
	}
}