.sk-folding-cube {
    margin: 20px auto;
    top: 40%;
    width: 100px;
    height: 100px;
    position: relative;
    -webkit-transform: rotateZ(45deg);
    transform: rotateZ(45deg);
}

    .sk-folding-cube .sk-cube {
        float: left;
        width: 50%;
        height: 50%;
        position: relative;
        -webkit-transform: scale(1.1);
        -ms-transform: scale(1.1);
        transform: scale(1.1);
    }

        .sk-folding-cube .sk-cube:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: #98d363;
            -webkit-animation: sk-foldCubeAngle 2.4s infinite linear both;
            animation: sk-foldCubeAngle 2.4s infinite linear both;
            -webkit-transform-origin: 100% 100%;
            -ms-transform-origin: 100% 100%;
            transform-origin: 100% 100%;
        }

    .sk-folding-cube .sk-cube2 {
        -webkit-transform: scale(1.1) rotateZ(90deg);
        transform: scale(1.1) rotateZ(90deg);
    }

    .sk-folding-cube .sk-cube3 {
        -webkit-transform: scale(1.1) rotateZ(180deg);
        transform: scale(1.1) rotateZ(180deg);
    }

    .sk-folding-cube .sk-cube4 {
        -webkit-transform: scale(1.1) rotateZ(270deg);
        transform: scale(1.1) rotateZ(270deg);
    }

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

    .sk-folding-cube .sk-cube3:before {
        -webkit-animation-delay: 0.6s;
        animation-delay: 0.6s;
    }

    .sk-folding-cube .sk-cube4:before {
        -webkit-animation-delay: 0.9s;
        animation-delay: 0.9s;
    }

@-webkit-keyframes sk-foldCubeAngle {
    0%, 10% {
        -webkit-transform: perspective(140px) rotateX(-180deg);
        transform: perspective(140px) rotateX(-180deg);
        opacity: 0;
    }

    25%, 75% {
        -webkit-transform: perspective(140px) rotateX(0deg);
        transform: perspective(140px) rotateX(0deg);
        opacity: 1;
    }

    90%, 100% {
        -webkit-transform: perspective(140px) rotateY(180deg);
        transform: perspective(140px) rotateY(180deg);
        opacity: 0;
    }
}

@keyframes sk-foldCubeAngle {
    0%, 10% {
        -webkit-transform: perspective(140px) rotateX(-180deg);
        transform: perspective(140px) rotateX(-180deg);
        opacity: 0;
    }

    25%, 75% {
        -webkit-transform: perspective(140px) rotateX(0deg);
        transform: perspective(140px) rotateX(0deg);
        opacity: 1;
    }

    90%, 100% {
        -webkit-transform: perspective(140px) rotateY(180deg);
        transform: perspective(140px) rotateY(180deg);
        opacity: 0;
    }
}

.overlay {
    position: fixed; /* Sit on top of the page content */
    display: none; /* Hidden by default */
    width: 100%; /* Full width (cover the whole page) */
    height: 100%; /* Full height (cover the whole page) */
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5); /* Black background with opacity */
    z-index: 2; /* Specify a stack order in case you're using a different order for other elements */
    cursor: default; /* Add a pointer on hover */
}