#footer{
    background-color: #F0F2F5;
    text-align: center;
    padding: 43px 0;
}
#footer .footer_Btn {
    margin-bottom: 32px;
}
#footer .footer_Btn a{
    font-size: 16px;
    
    font-weight: bold;
    color: #333333;
    text-align: center;
}
#footer .footer_Btn a:nth-child(2),#footer .footer_Btn a:nth-child(4){
    margin: 0 99px;
}
#footer .bah{
    font-size: 14px;
    
    color: #777474;
}

.backTop{
    position: fixed;
    right: 30px;
    bottom: 100px;
    border: 3px solid #000;
    line-height: 45px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    text-align: center;
    z-index: 99;
    cursor: pointer;
    display: none;
}
.backTop img{
    width: 85%;
}
.backTop:hover{
    background: #bbb;
    border: 3px solid #bbb;
}
@media screen and (max-width: 525px){
    #footer .footer_Btn a:nth-child(2), #footer .footer_Btn a:nth-child(4){
        margin: 0 25px;
    }
}