*{
    margin: 0;
    padding: 0;
}
body{
    font-size: 4.75vw;
}
#app{
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: white;
    position: relative;
}
.topBg{
    width: 100%;
    height: auto;
}
.topBg img{
    width: 100%;
}
.collection{
    width: 80%;
    min-height: 50vh;
    padding-bottom: 10vh;
    background: url(/cn/images/download/radius.png) no-repeat;
    background-size: 100% 100%;
    border-radius: 20px;
    position: absolute;
    top: 64%;
    left: 50%;
    transform: translate(-50%,-50%);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    align-items: center;
}
.itemColl{
    width: 40%;
    border: 1px solid #222222;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 10px;
    padding: 2vw 0;
}
.itemColl img{
    margin-right: 10px;
    width: 3.5vw;
}
.itemColl span{
    font-size: 4.35vw;
}
.ogSign{
    position: fixed;
    width: 100%;
    bottom: 0;
    background: url(/cn/images/download/ogbg.png) no-repeat;
    background-size: 100% 100%;
    height: 15vh;
}
.freeImg{
    position: absolute;
    top: 1vh;
    right: 0;
    background: url("/cn/images/download/free@2x.png") no-repeat;
    background-size: 100% 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 17vw;
    height: 4vh;
}
.freeSpan{
    color: white;
    font-size: 3vw;
    margin-left: 2vw;
}
.signCover{
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
}
.signCover>img{
    margin: 0 6vw 0 13vw;
    width: 13vw;
}
.btnA{
    display: block;
    width: 25vw;
    text-decoration: none;
    color: white;
    height: 4.5vh;
    background: #6E5DB6;
    font-size: 4vw;
    text-align: center;
    line-height: 4.5vh;
    border-radius: 30px;
    margin-top: 1vh;
}