.loader {
    position: relative;
    height: 80px;
    width: 80px;
    top: 28%;
    top: -webkit-calc(50% - 43px);
    top: calc(50% - 43px);
    left: 35%;
    left: -webkit-calc(50% - 43px);
    left: calc(50% - 43px);
    border: 3px solid #fff;
    border-radius: 80px;
    -webkit-transform-origin: 50% 50%;
    transform-origin: 50% 50%;
    -webkit-animation: hourglass 2s ease-in-out infinite;
    animation: hourglass 2s ease-in-out infinite;
}