*
{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root
{
    --default:linear-gradient(to right bottom, #4868dc, #5276e1, #5e83e5, #6a90e8, #789deb, #72aaf3, #6eb7f9, #6dc3fe, #54d3ff, #42e1ff, #46effc, #5ffbf1);
}
body
{
   display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}
.bg
{
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: var(--default);
    z-index: -1;
}
.home
{
    position: absolute;
    top: 20px;
    right: 30px;
    color: #FFFFFF;
}
.home ion-icon
{
    width: 40px;
    height: 40px;
}
.home ion-icon:hover
{
    color: darkorange;
}
.content
{
    width: 800px;                               /*设置宽度*/
    height: 600px;                              /*设置高度*/
    /*border: 1px solid #000000;*/                  /*设置边框*/
    position: relative;
    perspective: 1500px;
}
.card {
    width: 400px;
    height: 600px;
    position: absolute; /*绝对定位*/
    right: 0;
    background: #fff;
    transform-origin: 0 50%;
}
.card.left
{
    transition: transform 1s;
    transform-style: preserve-3d;
    transform: rotateY(-180deg);
    z-index: 10000!important;
}
.card.left.right
{
    z-index: 10000!important;
}
    div.front, div.back
    {
        width: 100%;
        height: 100%;
        position: absolute;
        backface-visibility: hidden; /*隐藏*/
    }

    div.back
    {
    transform: rotateY(180deg); /*旋转180度*/

    }

    div.front
    {
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 20px;
        font-weight: bold;
        color: #032b38;
        padding: 30px;
        box-shadow: 0 0 30px rgba(0, 0, 0, 0.7) inset;
    }
    img
    {
        width: 100%;
        height: 100%;
    }
.stitle
{
    position: absolute;
    top: 30px;
    left: 30px;
    font-size: 24px;
    color: forestgreen;
    text-shadow: 0 2px 2px #4a4a4a;
}
.ctext
{
    position: absolute;
    top:80px;
    left: 40px;
    right: 40px;
    font-size: 16px;
    line-height: 30px;
}
.group-btn
{
    position: absolute;
    top: 50%;
    width: 880px;
    display: flex;
    justify-content: space-between;
}
.group-btn a
{
    width: 40px;
    height: 40px;
    line-height: 50px;
    color: #fff;
    z-index: 100;
    cursor: pointer;
}
.group-btn a:hover
{
    color: chocolate;
}
.group-btn ion-icon
{
    width: 40px;
    height: 40px;
}
.copyrighttext
{
    position: absolute;
    bottom: 40px;
    font-size: 12px;
    color: #FFFFFF;
    text-shadow: 0 0 10px rgba(0,0,0,0.7);
}