.loading-mask {
  position: relative;
}

/*
Because we set .loading-mask relative, we can span our ::before  
element over the whole parent element  
*/
.loading-mask::before {
  content: '';
  position: absolute;
  z-index: 99999;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgba(200, 200, 200, 0.7);
}

/*
Spin animation for .loading-mask::after  
*/
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(359deg);
  }
}

/*
The loading throbber is a single spinning element with three  
visible borders and a border-radius of 50%.  
Instead of a border we could also use a font-icon or any  
image using the content attribute.  
*/
.loading-mask::after {
    content: "";
    position: absolute;
    border-width: 3px;
    border-style: solid;
    border-color: transparent rgb(65,166,255) rgb(65,166,255);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    top: calc(50% - 12px);
    left: calc(50% - 12px);
    animation: 2s linear 0s normal none infinite running spin;
    filter: drop-shadow(0 0 2 rgba(0, 0, 0, 0.33));
    z-index: 9999999;
}

.loader {
    animation: spin 2s linear infinite;
    width: 12px;  
    display: inline-block;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}