#preloader-background {
    background: #fff none repeat scroll 0 0;
    height: 100%;
    left: 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 99999;
}

#preloader-background .preloader-wrapper {
    left: 50%;
    position: absolute;
    top: 50%;
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

/**
 *  Usage:
 */

.sk-spinner-pulse {
    width: 40px;
    height: 40px;
    margin: 40px auto;
    background-color: #333;
    border-radius: 100%;
    -webkit-animation: sk-pulseScaleOut 1s infinite ease-in-out;
    animation: sk-pulseScaleOut 1s infinite ease-in-out;
}

@-webkit-keyframes sk-pulseScaleOut {
    0% {
        -webkit-transform: scale(0);
        transform: scale(0);
    }
    100% {
        -webkit-transform: scale(1);
        transform: scale(1);
        opacity: 0;
    }
}

@keyframes sk-pulseScaleOut {
    0% {
        -webkit-transform: scale(0);
        transform: scale(0);
    }
    100% {
        -webkit-transform: scale(1);
        transform: scale(1);
        opacity: 0;
    }
}