#banner {
    background-image: url('https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Flag_of_the_United_States.svg/1280px-Flag_of_the_United_States.svg.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

#banner::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.45);
}

#banner-text {
    position: relative;
    text-align: center;
    color: white;
    z-index: 1;
}

#banner-text h1 {
    font-size: 3rem;
    text-shadow: 2px 2px 6px rgba(0,0,0,0.8);
    margin-bottom: 10px;
}

#banner-text p {
    font-size: 1.2rem;
    text-shadow: 1px 1px 4px rgba(0,0,0,0.8);
}

@media screen and (max-width: 768px) {
    #banner {
        height: 200px;
    }

    #banner-text h1 {
        font-size: 2rem;
    }

    #banner-text p {
        font-size: 1rem;
    }
}

@media screen and (max-width: 480px) {
    #banner {
        height: 160px;
    }

    #banner-text h1 {
        font-size: 1.5rem;
    }
}
```