.call-now{
    float:left;
}
.image2{
   display: none;
}
@media screen and (max-width: 667px) {
    .call-now{
        float:none;
    }
}

@media only screen and (max-width: 500px){
   .image1{
     display: none;
   }

   .image2{
     display: block;
   }
}