HTML:
<div class="pulse"></div>
CSS:
.pulse {
box-shadow: 0 0 0 0 rgba(232, 76, 61, 0.7);
cursor: pointer;
-webkit-animation: pulse 1.25s infinite cubic-bezier(0.66, 0, 0, 1);
-moz-animation: pulse 1.25s infinite cubic-bezier(0.66, 0, 0, 1);
-ms-animation: pulse 1.25s infinite cubic-bezier(0.66, 0, 0, 1);
animation: pulse 1.25s infinite cubic-bezier(0.66, 0, 0, 1);
}
@-webkit-keyframes pulse {to {box-shadow: 0 0 0 45px rgba(232, 76, 61, 0);}}
@-moz-keyframes pulse {to {box-shadow: 0 0 0 45px rgba(232, 76, 61, 0);}}
@-ms-keyframes pulse {to {box-shadow: 0 0 0 45px rgba(232, 76, 61, 0);}}
@keyframes pulse {to {box-shadow: 0 0 0 45px rgba(232, 76, 61, 0);}}