Sideboxes with different colours?

You have the class & id markers switched around. # = id, . = class. Also, you have two selectors that belong to different elements concatenated, which is the way to indicate that they both apply to the same element. They need to have a space between them (and be given in the exact order shown) to indicate that #categoriesHeading is inside .leftboxcontainer. Finally, #categoriesHeading is plenty specific to control the heading; you don't need .leftboxcontainer.

.leftboxcontainer #categoriesHeading {
    display:none;
} 

/*or just this*/
#categoriesHeading {
    display:none;
} 

Fantastic! The second suggestion did it! Thank you so much!

I have a related question. I figured out how to change the header images for my side boxes, but I don't want the same image appearing as my Center Box heading. Here is my stylesheet coding right now:

.leftBoxHeading, .centerBoxHeading, .rightBoxHeading {
margin: 0em;
background-color: #abbbd3;
background-image: url(../images/tile_back.gif);
padding: 0.5em 0.2em;
}

I tried replacing it with this, but when I did, the centerBox heading completely disappeared:

.leftBoxHeading, .rightBoxHeading {
margin: 0em;
background-color: #abbbd3;
background-image: url(../images/tile_back.gif);
padding: 0.5em 0.2em;
}

.centerBoxHeading, {
margin: 0em;
background-color: #abbbd3;
background-image: url(../images/tile2_back.gif);
padding: 0.5em 0.2em;
}

I'm sure I'm missing something simple. Can you help? Thanks!

.centerBoxHeading, {
margin: 0em;
background-color: #abbbd3;
background-image: url(../images/tile2_back.gif);
padding: 0.5em 0.2em;
}

I'm sure I'm missing something simple. Can you help? Thanks!
You have an extra comma that's not required
i..e should be

.centerBoxHeading {
margin: 0em;
background-color: #abbbd3;
background-image: url(../images/tile2_back.gif);
padding: 0.5em 0.2em;
}

THANK YOU!!! I knew I was missing something simple...:blush:

gizmo_girl:

THANK YOU!!! I knew I was missing something simple...
Pleased to hear problem sorted..well done!!
:clap: