.pre-loader {
position: fixed;
z-index: 1; /** make sure this is the highest value compared to all other divs **/
top: 0;
bottom: 0;
left: 0;
right: 0;
display: flex;
justify-content: center;
align-items: center;
height: 100%;
width: 100%;
}

.pre-loader.hidden {
animation: fadeOut .5s; /** change to 1s */
animation-fill-mode: forwards;
}

@keyframes fadeOut {
    100% {
    opacity: 0;
    visibility: hidden;
    }
}

.pre-loader .spinner, .pre-loader .spinner:before, .pre-loader .spinner:after {
  border-radius: 50%;
  width: 2.5em;
  height: 2.5em;
  animation-fill-mode: both;
  animation: bblFadInOut 1.8s infinite ease-in-out;
}
.pre-loader .spinner {
  color: var(--custom-color);
  font-size: 7px;
  position: relative;
  text-indent: -9999em;
  transform: translateZ(0);
  animation-delay: -0.16s;
}
.pre-loader .spinner:before,
.pre-loader .spinner:after {
  content: '';
  position: absolute;
  top: 0;
}
.pre-loader .spinner:before {
  left: -3.5em;
  animation-delay: -0.32s;
}
.pre-loader .spinner:after {
  left: 3.5em;
}

@keyframes bblFadInOut {
  0%, 80%, 100% { box-shadow: 0 2.5em 0 -1.3em }
  40% { box-shadow: 0 2.5em 0 0 }
}