.overview-content .g{background-image:url(./img/g.jpg);}
.overview-content .i{background-image:url(./img/i.jpg);}
@media (max-width:736px){
  .overview-content .g{background-image:url(./m/g.jpg);}
  .overview-content .i{background-image:url(./m/i.jpg);}
}