body {
    font-family: Arial, sans-serif;
    color: #333;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background-color: #ededed;
}

header, footer {
    text-align: center;
    padding: 1em 0;
}

header h1 {
    margin: 0.5em 0;
    box-shadow: 3px 3px 6px #cccccc, -3px -3px 6px #fff;
    margin-left: 150px;
    margin-right: 150px;
    margin-bottom: 50px;
}



main {
    padding: 20px;
}



.gallery h2 {
    text-align: center;
}

.images {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    margin-top: 20px;
}

.images img {
    max-width: 30%;
    height: auto;
    margin: 10px;
}

#back {
    font-size: 20px;
    box-shadow: 3px 3px 6px #cccccc, -3px -3px 6px #fff;
    text-align: center;
}

@media (max-width: 600px) {
    .images img {
        max-width: 100%;
    }
}