div.back {
    display: none;
    width: 100%;
    min-height: 100%;
}

div.front {
    width: 100%;
    min-height: 100%;
}


div.coinside {
    display: none;
    width: 100%;
    min-height: 100%;
    border: 0px solid #00a0e3;
    border-radius: 50%;
    background-color: #00a0e3;
    width: 500px;
    height: 500px;
    position: relative;
}

div.coinside div.back-container {
    width: 485px;
    height: 485px;
    border: 3px solid #fff;
    border-radius: 50%;
    position: absolute;
    top: 4px;
    left: 4px;
}