Pulse

.pulse is a helper class that gives animation to the element ::after so it will get users' attention where is it necessary.

index.html

<div class="pulse my-box style-blue flex-center edge-round-md">Hello!</div>
<div class="pulse my-box style-orange flex-center edge-round-md">Hola!</div>
<div class="pulse my-box style-green flex-center edge-round-md">Salut!</div>

style.css

.my-box {
  width: 150px;
  height: 100px;
  margin: 50px;
}