@media only screen and (max-width:990px){
    .aside-img{
          margin: 0 0 0 0px;
      }
    .main {
      width:400px;height:400px; margin-left:0; 
     }
     .box {
  width: 100%;
  height: 15%;
  border:5px solid white;
  overflow:auto;
}
}