body {
    background: url(../img/fundo_qualyta.png);
    background-color: #2c3e50;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    margin: 0;
    min-height: 100vh;
}

@media only screen and (max-width: 700px) {
    body {
        background: url(../img/fundo_qualyta.png);
        background-color: #2c3e50;
        background-size: cover;
        background-position: center;
    }
}