.card {
    border: none;
}

#principal {
    background-color: #0141eb;
    color: #fff;
}

.btn {
    background-color: #fd3e01;
    background-image: linear-gradient(to right, #fd3e01, #fb6801);
    border: 1px solid #fb6801;
    color: #fff;
}

.btn:hover,
.btn:focus {
    background-color: #fd3e01;
    background-image: linear-gradient(to right, #fb6801, #fd3e01);
    border: 1px solid #fd3e01;
    color: #fff;
}

@media (max-width: 768px) {
    #principal img {
        width: 50%;
    }
}