body {
    background-image: url(../img/Palacio_da_Alvorada_Music_Room.JPG);
    background-repeat: no-repeat;
    background-size: cover;
}

h1 {
    color: white;
}

form {
    margin-top: 3rem;
    color: white;
    background-color: transparent;
    position:relative;
    top: calc(50%-15rem);
    padding: 2rem;
    background-color: rgba(0,0,0,0.7);
    border-radius: 0.5rem;
}

    form label {
        font-size: 150%;
    }
/*
.container {
    border: 1px solid red;
}
    */