@media screen and (max-width:768px) {

    .container{
        width: 300px !important;
        margin: 200px auto;
    }
    .calculadora{
        width: 300px; 
    }
    
}

@media screen and (max-width:320px) {
    .container{
        max-width: 260px !important;
    }
    .calculadora{
        font-size: 15px;
        max-width: 250px;
       
    }
    
}