QUESTDB_website/static/css/modal.css

/* Start by setting display:none to make this hidden.
   Then we position it in relation to the viewport window
   with position:fixed. Width, height, top and left speak
   for themselves. Background we set to 80% white with
   our animation centered, and no-repeating */
   .modal {
    display:    none;
    position:   fixed;
    z-index:    1000;
    top:        0;
    left:       0;
    height:     100%;
    width:      100%;
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    background-color: rgba(255,255,255,.3);
}

/* When the body has the loading class, we turn
   the scrollbar off with overflow:hidden */
body.loading .modal {
    overflow: hidden;
}

/* Anytime the body has the loading class, our
   modal element will be visible */
body.loading .modal {
    display: block;
    cursor: wait
}
.modal .content {
  position: absolute;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}