body{
    font-family: Arial, Helvetica, sans-serif;
    margin:0;
    background:#f4f4f4;
}

header{
    background:#333;
    color:white;
    padding:20px;
}

nav ul{
    list-style:none;
    padding:0;
}

nav ul li{
    display:inline;
    margin-right:15px;
}

nav a{
    color:white;
    text-decoration:none;
    font-weight:bold;
}

main{
    padding:20px;
    background:white;
}

footer{
    background:#222;
    color:white;
    text-align:center;
    padding:15px;
    margin-top:20px;
}

.gallery{
    display:flex;
    gap:20px;
}

.gallery img{
    width:200px;
}