there's different css codes that need to be used, you'll need a text editor to make them, cave them as .css, upload them to Dropbox, copy the Dropbox code into a new code and save it to your den.

Here's the code for backrounds,

body {
background: url('BACKGROUND URL HERE') center center fixed;
background-size: 100%;
font-family: FONT CSS HERE;
color: #HEX COLOR HERE;
}

and here's the codes for cave images.

/* PREGNANT LIONESSES */

div.cave-grid>img {
content: url('https://puu.sh/EJV1D/dfefa228df.png')!important;
}


/* CAVES (Copy paste to add more) */

a[href$="CAVE ID HERE"]>div.cave-grid>img {
content: url('IMAGE URL HERE')!important;
}


/* UNSORTED */

a[href$="unsorted.php?id=USERID"]>div.cave-grid>img {
content: url('IMAGE URL HERE')!important;
}


/* PRIDE OVERVIEW */

a[href$="lionoverview.php?id=USERID"]>div.cave-grid>img {
content: url('IMAGE URL HERE')!important;
}

Css are so much more than these though, a lot of things can be customized. And unless you understand css it is very difficult to do.
I have a css thread if you find you need someone to put together your perfect den.
https://www.lioden.com/topic.php?id=304429401099

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