index.css

#main-div {
    margin: 0 0 0 0;
    padding: 0 0 0 0;
    background: #66FFCC;
    position: relative;
    height: 100%;
    width: 100%;
    margin: 0 auto;
    overflow-x: hidden;
    overflow-y: hidden;
}

#loading{
    width: 50%;
    transform: translate(-50%, -50%);
    position: absolute;
    top: 50%;
    left: 50%;
}

body, html{
    margin: 0 0 0 0;
    height: 100%;
    width: 100%;
    overflow-x: hidden;
    overflow-y: hidden;
}
p{
    text-align: center;
}
.spinner {
    width: 60px;
    height: 60px;
    background-color: #67CF22;

    margin: 100px auto;
    -webkit-animation: rotateplane 1.2s infinite ease-in-out;
    animation: rotateplane 1.2s infinite ease-in-out;
}

@-webkit-keyframes rotateplane {
    0% {
        -webkit-transform: perspective(120px)
    }
    50% {
        -webkit-transform: perspective(120px) rotateY(180deg)
    }
    100% {
        -webkit-transform: perspective(120px) rotateY(180deg) rotateX(180deg)
    }
}

@keyframes rotateplane {
    0% {
        transform: perspective(120px) rotateX(0deg) rotateY(0deg);
        -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg)
    }
    50% {
        transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
        -webkit-transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg)
    }
    100% {
        transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
        -webkit-transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
    }
}