@charset "utf-8";
.web {
 width: 300px;
 height: 100px;
 background-color: pink;
}
@media screen and (min-width:500px){ 
 .box{
   width: 500px;
   background-color: green;
 }
}
@media screen and (min-width:1000px){ 
 .box{
   width: 1000px;
   background-color: blue;
 }
}



	
}