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


body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    background-image: url("the_iop-ruhr-area-8770681_1920.png");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}


.header {
    background-color: hsla(0, 3%, 70%, 0.933);
    padding: 30px;
    text-align: center;
    color: white;
}


.background {
    background-image: url("OIP (6).jfif");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    height: 60vh;
    width: 100%;
    margin-top: 9px;

    display: flex;
    flex-direction: column;
    align-items: center;
}


.nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    padding-top: 20px;
}

.nav a {
    text-decoration: none;
    color: white;
    padding: 5px 10px;
    transition: 0.3s;
}

.nav a:hover {
    background-color: lawngreen;
    color: #000;
    border-radius: 4px;
}


.background button {
    padding: 10px;
    color: white;
    background-color: lawngreen;
    width: 200px;
    border-radius: 4px;
    border: none;
    margin-top: auto;
    margin-bottom: 40px;
    transition: 0.3s;
    cursor: pointer;
}

.background button:hover {
    background-color: rgb(0, 252, 218);
    color: #000;
}


.image {
    background-color: hsla(0, 3%, 70%, 0.933);
    padding: 30px;
    text-align: center;
    color: white;
    margin-top: 10px;
}


.art1,
.art2 {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    padding: 20px;
}


.art,
.art3 {
    background-color: hsla(0, 3%, 70%, 0.933);
    padding: 7px;
    border-radius: 5px;
    flex: 1 1 22%;
    max-width: 250px;
}


.art img,
.art3 img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    transition: 0.3s;
}

.art img:hover,
.art3 img:hover {
    transform: scale(1.05);
}


.footer {
    background-color: hsla(0, 3%, 70%, 0.933);
    padding: 30px;
    text-align: center;
    color: white;
    margin-top: 10px;
}
@media (max-width: 992px) {
    .art,
    .art3 {
        flex: 1 1 45%;
    }
}


@media (max-width: 600px) {

    .art,
    .art3 {
        flex: 1 1 100%;
    }

    .background {
        height: 45vh;
    }

    .background button {
        width: 150px;
        margin-bottom: 20px;
    }

    .header,
    .image,
    .footer {
        padding: 20px;
        font-size: 14px;
    }
}