Thanks New Nine, that was perfect.
Haven’t played with CSS before but that made it much clearer for me.
After separating the #sidebar1 style I then figured out that I could instead leave the sidebar1 and sidebar setup as the the designer intended, but I instead added
<div id="twitter>
<div>
either side of the Twitter widget script and then added
twitter {
design: inline
}
to style.css.
Thanks for the solution. If I’m ever doing a gig in Chigago, you get in for free.