.blocker{
    width: 100%;
    height: 100%;
    z-index: 100000;
    background: #0a0a0abf;
    top: 0;
    left: 0;
    position: fixed;
}

.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;
    position: fixed;
    top:50%;
    left:50%;
    transform: translate(-50%,-50%);
}

@keyframes spin {
    0% { transform: translate(-50%,-50%) rotate(0deg); }
    100% { transform: translate(-50%,-50%) rotate(360deg); }
}