* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

section {
    height: 100vh;
    width: 100%;
}

section:nth-child(2n) {
    background-color: #f0f0f0;
}

.background {
    /* background-image: url('https://promusicamundi.pl/assets/baner-84551663.webp'); */
    /* background-attachment: fixed; */
}

.img {
    position: fixed;
    height: 100vh;
    width: 100%;
    background-color: red;
    z-index: -1;
    background-image: url('https://promusicamundi.pl/assets/baner-84551663.webp');
    background-size: cover;
    background-position: center;
}