@keyframes loader {
    to {
        transform: rotate(360deg);
    }
}

.loader {
    position: relative;
}

.loader::before {
    content: "";
    display: block;
    position: absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;
    background-color: #000000;
    opacity: 0.2;
    z-index: 998;
}

.loader::after {
    content: '';
    box-sizing: border-box;
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin-top: -10px;
    margin-left: -10px;
    border-radius: 50%;
    border-top: 2px solid #07d;
    border-right: 2px solid transparent;
    animation: loader .6s linear infinite;
    z-index: 999;
}