.content-mask{
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 100;
    background:  linear-gradient(#ffffff62,#e2e2e26c);
    top: 0;
    left: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}
.content-loader{
    width: 48px;
    height: 48px;
    border: 5px solid #cfcfcf;
    border-bottom-color: #636363;
    border-radius: 50%;
    display: inline-block;
    -webkit-animation: rotation 1s linear infinite;
    animation: rotation 1s linear infinite;
}

@keyframes rotation {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(360deg);
    }
}

@-webkit-keyframes rotation {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(360deg);
    }
}