.loader {
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 120px;
    height: 120px;
    animation: spin 2s linear infinite;
    margin:auto;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.mask {
    height: 100%;
    width: 100%;
    position: fixed;
    _position: absolute;
    top: 0;
    z-index: 100000;
}

.opacity {
    opacity: 0.3;
    filter: alpha(opacity=30);
    background-color: #000;
}