body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: #333;
    color: #fff;
    padding: 1px;
    text-align: center;
}

main {
    padding: 10px;
}

.gallery {
    display: flex;
    flex-wrap: wrap;
    justify-content:   
 space-between;
}

img {
    max-width: 300px;
    height: auto;
    margin: 10px;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 10px;
    text-align: center;
}

.gallery img {
    max-width: 100%;
    height: auto;
}