@media only screen and (min-width : 591px) and (max-width: 769px){
    .main{
        margin-top: 80px;
    }
    .row button{
        font-size: 20px;
    }
}
@media only screen and (min-width : 0) and (max-width: 590px){
    .main{
         margin: 20px 10px;
    }
    .row button{
        font-size: 20px;
    }
}