.background {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #157ce2;
}

    .background > .wrapper {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        -webkit-transform: translate(-50%, -50%);
    }

.sk-cube-grid {
    width: 40px;
    height: 40px;
    margin: 100px auto;
}

    .sk-cube-grid .sk-cube {
        width: 33%;
        height: 33%;
        background-color: #ffffff;
        float: left;
        -webkit-animation: sk-cubeGridScaleDelay 1.3s infinite ease-in-out;
        animation: sk-cubeGridScaleDelay 1.3s infinite ease-in-out;
    }

    .sk-cube-grid .sk-cube1 {
        -webkit-animation-delay: 0.2s;
        animation-delay: 0.2s;
    }

    .sk-cube-grid .sk-cube2 {
        -webkit-animation-delay: 0.3s;
        animation-delay: 0.3s;
    }

    .sk-cube-grid .sk-cube3 {
        -webkit-animation-delay: 0.4s;
        animation-delay: 0.4s;
    }

    .sk-cube-grid .sk-cube4 {
        -webkit-animation-delay: 0.1s;
        animation-delay: 0.1s;
    }

    .sk-cube-grid .sk-cube5 {
        -webkit-animation-delay: 0.2s;
        animation-delay: 0.2s;
    }

    .sk-cube-grid .sk-cube6 {
        -webkit-animation-delay: 0.3s;
        animation-delay: 0.3s;
    }

    .sk-cube-grid .sk-cube7 {
        -webkit-animation-delay: 0s;
        animation-delay: 0s;
    }

    .sk-cube-grid .sk-cube8 {
        -webkit-animation-delay: 0.1s;
        animation-delay: 0.1s;
    }

    .sk-cube-grid .sk-cube9 {
        -webkit-animation-delay: 0.2s;
        animation-delay: 0.2s;
    }

@-webkit-keyframes sk-cubeGridScaleDelay {
    0%, 70%, 100% {
        -webkit-transform: scale3D(1, 1, 1);
        transform: scale3D(1, 1, 1);
    }

    35% {
        -webkit-transform: scale3D(0, 0, 1);
        transform: scale3D(0, 0, 1);
    }
}

@keyframes sk-cubeGridScaleDelay {
    0%, 70%, 100% {
        -webkit-transform: scale3D(1, 1, 1);
        transform: scale3D(1, 1, 1);
    }

    35% {
        -webkit-transform: scale3D(0, 0, 1);
        transform: scale3D(0, 0, 1);
    }
}

h1 {
    color: lightgrey;
    text-align: center;
    font-size: 1.6em;
    margin-top: 40px;
}