score:1

Accepted answer

the solution is to use css "breathing" animation. an example how it works:

#breathing-button {
    width: 270px;
    padding: 20px;
    margin: 50px auto;
    border: 1px solid #d1d1d1;
    -webkit-animation: breathing 7s ease-out infinite normal;
    animation: breathing 7s ease-out infinite normal;
    font-size: 24px;
    background: #5885cb;
    color: #fff;
    -webkit-font-smoothing: antialiased;
    border-radius: 3px;
    text-align: center;    
    }


@-webkit-keyframes breathing {
  0% {
    -webkit-transform: scale(0.9);
    transform: scale(0.9);
  }

  25% {
    -webkit-transform: scale(1);
    transform: scale(1);
  }

  60% {
    -webkit-transform: scale(0.9);
    transform: scale(0.9);
  }

  100% {
    -webkit-transform: scale(0.9);
    transform: scale(0.9);
  }
}

@keyframes breathing {
  0% {
    -webkit-transform: scale(0.9);
    -ms-transform: scale(0.9);
    transform: scale(0.9);
  }

  25% {
    -webkit-transform: scale(1);
    -ms-transform: scale(1);
    transform: scale(1);
  }

  60% {
    -webkit-transform: scale(0.9);
    -ms-transform: scale(0.9);
    transform: scale(0.9);
  }

  100% {
    -webkit-transform: scale(0.9);
    -ms-transform: scale(0.9);
    transform: scale(0.9);
  }
}
<div id="breathing-button">breathing button</div>


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