body {
    background-color: goldenrod;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
}

header {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
}

main {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    align-items: center;
    padding: 20px;
    gap: 20px;
}

.image-box {
    width: 200px;
    height: 200px;
    background-size: cover;
    background-position: center;
    border: 2px solid #333;
    transition: background-image 0.3s ease;
}

#box1 {
    background-image: url('1.jpg');
}
#box1:hover {
    background-image: url('3.jpg');
}

#box2 {
    background-image: url('2.jpg');
}
#box2:hover {
    background-image: url('4.jpg');
}

#box3 {
    background-image: url('5.jpg');
}
#box3:hover {
    background-image: url('6.jpg');
}

#box4 {
    background-image: url('7.jpg');
}
#box4:hover {
    background-image: url('8.jpg');
}

#box5 {
    background-image: url('9.jpg');
}
#box5:hover {
    background-image: url('10.jpg');
}

#box6 {
    background-image: url('11.jpg');
}
#box6:hover {
    background-image: url('12.jpg');
}

#box7 {
    background-image: url('13.jpg');
}
#box7:hover {
    background-image: url('14.jpg');
}

#box8 {
    background-image: url('15.jpg');
}
#box8:hover {
    background-image: url('16.jpg');
}

#box9 {
    background-image: url('17.jpg');
}
#box9:hover {
    background-image: url('18.jpg');
}

footer {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
}