#spin {
        width: 50px;
        height: 50px;
        border: 5px solid #ccc;
        border-top-color: #f50;
        border-radius: 100%;
        position: fixed;
        top: 0;
        right: 0;
        left: 0;
        bottom: 0;
        margin: 0;
        margin: auto;
        animation: round 2s linear infinite;
    }

    @keyframes round {
        from {
            transform: rotate(0deg);
        }

        to {
            transform: rotate(360deg);
        }
    }

    #overlay {
        height: 100%;
        width: 100%;
        background: rgba(0,0,0,.8);
        position: fixed;
        top: 0;
        left: 0;
        z-index: 999;
    }