@media (min-width: 900px) and (max-width: 980px) {

    #principal {
        margin-left: 40px;
    }
}
@media (min-width: 500px) and (max-width: 2000px) {

    #btnFinalizarCommpra {
        border-radius: 0px; 
        width: 81%; 
        height: 30px; 
        padding-top: 15px; 
        font-family: oratorstd; 
        font-size: 19px; 
        margin: 3.5% 3.5% 0; 
        color: #ffffff;
    }

    #btnAddCar {
        width: 91%; 
        border-radius: 0px; 
        font-size: 15px; 
        margin: 3.5%; 
        font-family: oratorstd; 
        padding: 15px 0;
    }
}
@media (min-width: 500px) and (max-width: 899px) {

    #btnFinalizarCommpra {
        border-radius: 0px; 
        width: 81%; 
        height: 30px; 
        padding-top: 15px; 
        font-family: oratorstd; 
        font-size: 13px; 
        margin: 3.5% 3.5% 0; 
        color: #ffffff;
    }

    #btnAddCar {
        width: 91%; 
        border-radius: 0px; 
        font-size: 13px; 
        margin: 3.5%; 
        font-family: oratorstd; 
        padding: 15px 0;
    }
}