#video-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

#video-btn::before {
  width: 80px;
  height: 80px;
}
#video-btn::before {
  content: "";
  position: absolute;
  z-index: -9;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  display: block;
  width: 50px;
  height: 50px;
  background: #CE1324; 
  border-radius: 50%;
  -webkit-animation: pulse-border 1500ms ease-out infinite;
  animation: pulse-border 1500ms ease-out infinite;
}


.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.9);
  }

  .modal-content {
    position: relative;
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    margin-top: 10%;
  }

  .close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
  }

  .close:hover {
    color: #bbb;
  }