.overview-content .a{background-image:url(a.jpg);}
.overview-content .d{background-image:url(d.jpg);}
.overview-content .b li:nth-of-type(1) div,.overview-content .b li:nth-of-type(2) div,.overview-content .b li:nth-of-type(3) div{height:25px;}
@media screen and (max-width: 736px){
.overview-content .a{background-image:url(../m_a.jpg);}
.overview-content .d{background-image:url(../m_d.jpg);}
}