@media screen and (max-width: 600px) {
    #div1{
        border-style: solid;
        border-width: 2px;
        border-color: black; 
        width: 94%; 
        margin-left: 15px; 
        background-color: white; 
        border-radius: 5px;
    }   
}
@media screen and (min-width: 601px) {
    #div1{
        border-style: solid; 
        width: 98%; 
        margin-left: 15px; 
        background-color: white; 
        border-radius: 5px;
    }   
}