[development] Theme lose HTML formatting after being changed

[rsw-ml at silverarc.biz]

hello,

I have been experiencing a very strange problem here. I am using Drupal6.8
Whenever I try to change even the text-color( the tiniest example) in my
existing theme...
The HTML formatting suddenly disappears!!


I have no clue as to what is happening here..I am very new to Drupal

Hope to receive a reply asap
Thanks :)
Radhika