CSS Filtering Out From Blocks

Hello,

I am just starting to delve into the land of Drupal and open source CMS systems and I have to say this is by far one of the best systems I have come across. I have one issue that seems to be plaguing me, however; I am using the acquia slate theme and am having difficulty getting CSS inserted into blocks on the front page. I have a block that has some introduction material over the banner and would like to change just one word to be a different color than the rest to have it stick out. I tried to use <span style="color:green;">WORD</span> but it seems that Drupal takes the style out and doesn't show my formatting. Is there any way to get this to work? Or am I going about it the wrong way? Thanks again for all of your help!

Thanks again!