Centre spinner

gistfile1.txt

        .loading{
            position: absolute;
            height: 100px;
            width: 100px;
            top: 50%;
            left: 50%;
            margin-left: -50px;
            margin-top: -50px;
            background: url(/Resources/Images/notched-circle.png);
            background-size: 100%;
            animation: spin 1s infinite linear;
        }

        @@keyframes spin {
            0%   {transform: rotate(0deg)}
            100% {transform: rotate(360deg)}
        }