body {
color: black;
background-color: none;
font-family: Arial, sans-serif;
}
hr {
border: 1px solid black;
}
header, footer {
width: auto;
height: 40;
margin: 8mm 10mm;
text-align: center;
}

#gallery {
width: auto;
max-height: 200mm;
padding: 6mm;
margin: 8mm 10mm;
border: 1px solid black;
}
#gallery img {
width: auto;
height: 40mm;
margin: 0.5mm;
outline: 1px solid black;
}