I coded the website with the help of:

W3schools tutorials
sadgrl.online resources
Brackets, a free open-source editor
Ayano's guestbook code
Stack Overflow users who 8 years ago had the same problem as me

The visual elements are from the following sources:

Internet Archive on Flickr
British Library on Flick
jojo-ojoj on DeviantArt
Leichnam on DeviantArt
Amaruuk on Ko-fi
patricia m on Flickr
devoral on DeviantArt
DaydreamersDesigns on DeviantArt