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<a href="#" id="order-btn" data-href="#order-popup" data-toggle="modal" data-target="#order-popup" class="order-btn">
            <span class="order-btn-in">Отправить заявку</span>
        </a>

.order-btn {
  position: fixed;
  bottom: 200px;
  right: 8%;
  z-index: 100;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  border-radius: 50%;
  width: 90px;
  height: 90px;
  text-align: center;
  color: #ffffff;
}
.order-btn::before {
  content: '';
  position: absolute;
  left: -20px;
  top: -20px;
  z-index: 1;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  border-radius: 50%;
  width: 130px;
  height: 130px;
  background-color: rgba(209, 37, 46, 0.25);
  /*-webkit-animation: pulse 1.5s linear infinite;*/
  /*animation: pulse 1.5s linear infinite;*/
}
.order-btn::after {
  content: '';
  position: absolute;
  left: -10px;
  top: -10px;
  z-index: 2;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  border-radius: 50%;
  width: 110px;
  height: 110px;
  background-color: rgba(209, 37, 46, 0.25);
  /*-webkit-animation: pulse 1.5s linear infinite;*/
  /*animation: pulse 1.5s linear infinite;*/
}
.order-btn-in {
  position: relative;
  z-index: 3;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  width: 90px;
  height: 90px;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  border-radius: 50%;
  font-size: 14px;
  background-color: #d1252e;
}
@-webkit-keyframes pulse {
  0% {
    -webkit-transform: scale(0.9);
    transform: scale(0.9);
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    -webkit-transform: scale(1.2);
    transform: scale(1.2);
    opacity: 0;
  }
}
@keyframes pulse {
  0% {
    transform: scale(0.9);
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    transform: scale(1.2);
    opacity: 0;
  }
}