Finally edited my blogger template: removed borders for the widgets and unified the background colors. It looks much cleaner now, especially at the bottom page. Funny how these minor changes can make such a big difference.
I used webputty.net, a new CSS editor that allows users to preview the changes instantly and also to update them to their website with a click of a button.
(1) Log in with your Gmail account ;
(2) Copy and paste in your template the Java script provided by WebPutty.net;
(3) Tips from DH: back up the HTML/CSS source code first, then delete all "style" codes in your original template to avoid overlapping;
(4) Start editing on WebPutty. Hooray for the two column panes!
A single account can be used to edit several websites.
According to WebPutty's front page, it's free for early adopters. Have fun!