/*这10个问题你必须知道，白底样式begin*/

.content4 li.li1 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_01.png) no-repeat;
}
.content4 li.li2 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_02.png) no-repeat;
}
.content4 li.li3 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_03.png) no-repeat;
}
.content4 li.li4 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_04.png) no-repeat;
}
.content4 li.li5 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_05.png) no-repeat;
}
.content4 li.li6 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_06.png) no-repeat;
}
.content4 li.li7 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_07.png) no-repeat;
}
.content4 li.li8 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_08.png) no-repeat;
}
.content4 li.li9 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_09.png) no-repeat;
}
.content4 li.li10 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_010.png) no-repeat;
}
.content4 li.li11 div{
    background: url(https://www.k12zx.com/statics/index/zt_2_img/img_011.png) no-repeat;
}

/*这10个问题你必须知道，白底样式end*/