#tap-loader {
    width: 28px;
    height: 28px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 12px auto;
}

/* Spinner animation */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

div#loader {
    left: 50%;
    margin: 0 auto;
    position: absolute;
}

.main-div {
  max-width: 700px;
  margin: auto;
  text-align: center;
  padding: 70px;
  box-shadow: 0px 0px 10px #00000017;
  border-radius: 10px;
 
}
.main-upper-div{
     display: flex;
    flex-direction: column; 
    align-content: center; 
    justify-content: center; 
    height: 100%; 
}