.loader {
    display: inline-block;
    width: 80px;
    height: 80px;
}

.loader.center {
    right: 50%;
    bottom: 50%;
    transform: translate(50%,50%);
    position: absolute;
}

.loader:after {
    content: " ";
    display: block;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 6px solid #fff;
    border-right-color: transparent;
    border-left-color: transparent;
    animation: loader 1.2s linear infinite;
}

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