Question: Is It Possible to Modify Gallery Styles? + Header Help

Hi, so like some others have posted, I really like the St. Patrick's style overall, mostly due to the header image with the shamrock. 

1. I tried modifying the CSS and putting my image in the shamrock's place; however, the entire header just disappeared.
2. So, I created a new style, named WildThyme, and copied the St. Patrick's style into it, then changed the header image address.  Still no luck.
This is what the code looked like both times.

/* the framing graphics */
#header
{
    padding-left: 20px;
    background: url(https://wildthyme.createaforum.com/styles/wildthyme/files/4093_wild thyme.png) bottom;
    margin: 0 auto;
    width: 97%;
}
#header div.frame
{
    display: block;
    padding: 5px 20px 1em 0;
}

What am I doing wrong?  I've found other people who said they had the same problem on old posts, but they never shared how they fixed it!

Seems ok.
I would try uploading a filename without spaces in the filename and see if that helps i notice it is
https://wildthyme.createaforum.com/styles/wildthyme/files/4093_wild thyme.png

That did work, thanks!  Funny how the custom icons don't mind spaces in the titles, but the CSS does.  You learn something new every day!