Simple CSS Example

View the article at http://ryanflorence.com/css-transition

HTML

<div class="parent">
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
</div>

CSS

.parent {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}

.parent div:nth-child(-2n+20) {
  background-color: blue;
  color: white;
}

.child {
  width: 30px;
  height: 30px;
  margin: 10px;
  border: 1px solid black;
  display: flex;
  align-items: center;
  justify-content: center;
}