.xz_box{
    position: relative;
    
}

.xz_pc,.xz_ios,.xz_android{
    width: 140px;
    height: 50px;
    float: left;
    margin-right: 0px; 
    margin-left: 0px; 
    text-indent: -9999rem; 
    margin-top: 2px;
}

.xz_pc{
    background: #45180f url(../image/xz_pc.png) no-repeat top center; 
}

.xz_ios{
    background: #45180f url(../image/xz_ios.png) no-repeat top center; 
}

.xz_android{
    background: #45180f url(../image/xz_android.png) no-repeat top center; 
}

.xz_pc:hover{
    background: #45180f url(../image/xz_pc_hover.png) no-repeat top center; 
}
.xz_ios:hover{
    background: #45180f url(../image/xz_ios_hover.png) no-repeat top center; 
}
.xz_android:hover{
    background: #45180f url(../image/xz_android_hover.png) no-repeat top center; 
}