.cover {
    background: rgba(0,0,0, 0.5);
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 99999;
}

.loader {
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 70px;
    height: 70px;
    animation: spin 2s linear infinite;
    margin: 0 auto;
    top: 45%;
    position: relative;
}