body {
    background-color: #09f;
}

.frame {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    height: 400px;
    margin-top: -200px;
    margin-left: -200px;
    border-radius: 2px;
    box-shadow: 4px 8px 16px 0 rgba(0, 0, 0, 0.1);
    overflow: hidden;
    background-color: #444444;
    color: #333;
    font-family: "Open Sans", Helvetica, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.top {
    position: absolute;
    top: 0;
    left: 0;
    background-color: #444;
    bottom: 50%;
}

.bottom {
    position: absolute;
    top: 50%;
    background-color: #37d493;
    width: 100%;
    height: 200px;
}

.ellipse, .green, .gray {
    position: absolute;
    width: 420px;
    height: 400px;
    border-radius: 50%;
}

.ellipse {
    position: absolute;
    transform-style: preserve-3d;
    top: 0;
    left: -10px;
    z-index: 2;
    animation: elastic 5s ease-in-out infinite;
}

@keyframes elastic {
    0% {
        transform: rotateX(90deg);
    }

    15% {
        transform: rotateX(150deg);
    }
    
    20% {
        transform: rotateX(50deg);
    }
    
    25% {
        transform: rotateX(120deg);
    }
    
    30% {
        transform: rotateX(70deg);
    }
    
    35% {
        transform: rotateX(100deg);
    }
    
    40% {
        transform: rotateX(83deg);
    }
    
    45% {
        transform: rotateX(93deg);
    }

    50% {
        transform: rotateX(90deg);
    }

    65% {
        transform: rotateX(30deg);
    }

    70% {
        transform: rotateX(130deg);
    }

    75% {
        transform: rotateX(60deg);
    }

    80% {
        transform: rotateX(110deg);
    }

    85% {
        transform: rotateX(80deg);
    }

    90% {
        transform: rotateX(97deg);
    }

    95% {
        transform: rotateX(87deg);
    }

    100% {
        transform: rotateX(90deg);
    }
    
}

.gray {
    background-color: #444444;
    backface-visibility: hidden;
}

.green {
    background-color: #37d493;
    transform: rotateX(180deg);
    backface-visibility: hidden;
}