.overview-content .a{background-image:url(a.jpg);}
.overview-content .b{background-image:url(b.jpg);}
.overview-content .b .text .img{background-image:url(b.png);width:32.5em;height:15em;left:0;}
.overview-content .b .text .img .span1 {left:9.5%; }
.overview-content .b .text .img .span2 {left:67.5%; }
.overview-content .b .text .img .span3 {left:38.5%;}
.overview-content .b .text .img .span4 {left:1%; margin-top:33%;}
.overview-content .c{background-image:url(c.jpg);}
.overview-content .c .text .img{background-image:url(c.png);height:131px; width:247px; }
.overview-content .d{background-image:url(d.jpg);}
.overview-content .e{background-image:url(e.jpg);}
.overview-content .g{height:58.7em;background-image:url(g.jpg);background-position:top;}

@media (max-width:736px){
  .overview-content .a{background-image:url(m/a.jpg);}
  .overview-content .b{background-image:url(m/b.jpg);padding-bottom: 75%;}
  .overview-content .b .text .img{margin:2rem auto 0;}
  .overview-content .c{background-image:url(m/c.jpg);background-color: #fbfbfb;}
  .overview-content .d{background-image:url(m/d.jpg);}
  .overview-content .e{background-image:url(m/e.jpg);padding-bottom: 80%;}
  .overview-content .f{height:auto;background-color:#fafafa;}
  .overview-content .g{height:auto;background-image:url(m/g.jpg);background-position:bottom;padding-bottom: 102%;}
  .overview-content .g .tip { bottom:-60vw;left:46%;}
}