html, body,div{
    margin: 0;
    padding: 0;
}
.menuBox{
    width: 100%;
    height: 55px;
    background-color: #333;
    position: fixed;
    top: 0;
    left: 0;
    padding: 7.5px 5px;
    box-sizing: border-box;
}
.menu{
    width: 100%;
    height: 40px;
    background: linear-gradient(-31deg, #393E46, #3E4F52);
    border-radius: 10px;
    padding: 6px 12px;
    display: flex;
    justify-content: space-between;
    box-sizing: border-box;
}
.menu span{
    display: block;
    width: 60px;
    height: 28.5px;
    background: url("../img/border.png");
    background-size: cover;
    font-size: 12px;
    color: #AFC3C5;
    font-weight: bold;
    text-align: center;
    line-height: 28.5px;
    cursor: pointer;
}
.menu span.active{
    background: url("../img/borderOn.png");
    background-size: cover;
    color: #fff;
}
.topPlaceholder{
    width: 100%;
    height: 55px;
}
.img{
    width: 100%;
}
.img img{
    width: 100%;
    border: 0;
    display: block;
}
.btmPlaceholder{
    width: 100%;
    height: 61px;
}
.footer{
    width: 100%;
    height: 61px;
    background-color: #333;
    padding: 0 14px;
    overflow: hidden;
    box-sizing: border-box;
    position: fixed;
    left: 0;
    bottom: 0;
}
.footer .left{
    float: left;
}
.footer .left img{
    display: block;
    width: 140px;
    margin-top: 5.5px;
}
.footer .right{
    float: right;
}
.footer .right img{
    display: block;
    width: 169px;
    margin-top: 8.5px;
    animation: downloadbtn infinite 800ms ease-in-out;
}
@keyframes downloadbtn {
    0%{transform:scale(0.9);}
    30%{transform:scale(1.1);}
    30%{transform:scale(1);}
    100%{transform:scale(0.9);}
}