.round-button {
  width: 500px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.round-button-circle {
  width: 100%;
  height:0;
  padding-bottom: 100%;
  border-radius: 50%;
  border:10px solid #cfdcec;
  overflow:hidden;
        
  background: #63b13f; 
  box-shadow: 0 0 3px gray;

  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.round-button-circle:hover {
  background:#30588e;

  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.round-button a {
  display:block;
  //float:left;
  width:100%;
  padding-top:50%;
  padding-bottom:50%;
  //line-height:1em;
  //margin-top:-0.5em;
        
  text-align:center;
  color:#e2eaf3;
  font-family:Verdana;
  font-size:50pt;
  font-weight:bold;
  text-decoration:none;

  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

#bottom-banner-ad {
    position: absolute !important;
    bottom: 20px !important;
    left: 50% !important;
    transform: translate(-50%) !important;
}

#top-banner-ad {
    //position: absolute !important;
    top: 20px !important;
    left: 50% !important;
    transform: translate(-50%) !important;
}

.title {
    top: 200px !important;
    text-align:center;
    font-family:Verdana;
    font-size:20pt;
    font-weight:bold;
}
.instruct {
    text-align:center;
    font-family:Verdana;
    font-size:10pt;
    font-weight:bold;
}

@media only screen and (max-width: 600px) {
  .round-button {
    width:80%;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    }
}