.overview-content .area1{background-image:url('./p1.jpg');}
.overview-content .area2 .img{background-image:url('./p2.png');}
.overview-content .area3 .img{background-image:url('./p3.jpg');}
.overview-content .area4{background-image:url('./p4.jpg');}
@media (max-width:736px){
  .overview-content .area1{background-image:url('./mp1.jpg');}
  .overview-content .area3 .img{background-image:url('./mp3.png');}
  .overview-content .area4{background-image:url('./mp4.jpg');}
}