<div class="wrapper">
<div class="example-1">Example 1</div>
<div class="example-2">Example 2</div>
<div class="example-3">Example 3</div>
</div>
<div style="clear: both;"></div>

@import url('https://fonts.googleapis.com/css?family=Barlow+Semi+Condensed');

.wrapper
{ 
  padding: 20px;     
} 

@keyframes shadow-pulse
{
  0% {
    box-shadow: 0 0 0 0px rgba(0, 0, 0, 0.2);
  }
  100% {
    box-shadow: 0 0 0 35px rgba(0, 0, 0, 0);
  }
}

@keyframes shadow-pulse-big
{
  0% {
    box-shadow: 0 0 0 0px rgba(0, 0, 0, 0.1);
  }
  100% {
    box-shadow: 0 0 0 70px rgba(0, 0, 0, 0);
  }
}

.example-1
{
  float: left;
  margin: 40px;
  width: 130px;
  height: 130px;
  font: 13px/130px 'Barlow Semi Condensed', sans-serif;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #fff;
  text-align: center;
  background: rgba(30, 144, 255, 0.6);
  border-radius: 50%;
  animation: shadow-pulse 1s infinite;
}
.example-2
{
  float: left;
  margin: 75px 40px 0 40px;
  width: 130px;
  height: 60px;
  font: 13px/60px 'Barlow Semi Condensed', sans-serif;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #fff;
  text-align: center;
  background: rgba(3, 3, 3, 0.6);
  border-radius: 3px;
  animation: shadow-pulse 1s 3;
}
.example-3
{
  float: left;
  margin: 40px 0 0 40px;
  width: 130px;
  height: 130px;
  font: 13px/130px 'Barlow Semi Condensed', sans-serif;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #fff;
  text-align: center;
  background: rgba(30, 144, 255, 0.6);
  border-radius: 50%;
  animation: shadow-pulse-big 1s 1;
}