pulsing button

HTML

<div class="pulse-button-container">
    <button class="pulse-button">Call In</button>
</div>

CSS

body {
  background: black;
  font-family: sans-serif;
  color: #666;
  text-align: center;
}
.Float{
  float: right;
}.clear{
  clear: both;
}
.pulse-button-container {
  width: 300px;
  height: 100%;
  margin: 0 auto 0;
}

.pulse-button {
  position: relative;
  width: 150px;
  height: 150px;
  border: none;
  box-shadow: 0 0 0 0 rgba(232, 76, 61, 0.7);
  border-radius: 50%;
  background-color: #dc2763;
  color: white;
  font-size: 30px;
  cursor: pointer;
  -webkit-animation: pulse 1.5s infinite cubic-bezier(0, 0, 0, 1);
  -moz-animation: pulse 1.5s infinite cubic-bezier(0, 0, 0, 1);
  -ms-animation: pulse 1.5s infinite cubic-bezier(0, 0, 0, 1);
  animation: pulse 1.5s infinite cubic-bezier(0, 0, 0, 1);
}
.pulse-button:hover {
  -webkit-animation: none;
  -moz-animation: none;
  -ms-animation: none;
  animation: none;
}

@-webkit-keyframes pulse {to {box-shadow: 0 0 0 35px rgba(220,39,99, 0);}}
@-moz-keyframes pulse {to {box-shadow: 0 0 0 35px rgba(220,39,99, 0);}}
@-ms-keyframes pulse {to {box-shadow: 0 0 0 35px rgba(220,39,99, 0);}}
@keyframes pulse {to {box-shadow: 0 0 0 150px rgba(220,39,99, 0);}}