Hello, my name is ***** ***** I will do my best to assist you today.
You say that you are using CSS. Have you checked the CSS code, as well as the HTML code for colors? Are you using the names of the colors (i.e., "blue"), or are you using their HTML code color (i.e., "#333CFF")?
I have found that using the HTML code for colors in both locations usually works.
Here is a link to a webpage where you can look up HTML codes for colors:http://htmlcolorcodes.com/
I look forward to hearing back from you.
You can try clearing your browser history in IE:
Go to Tools -> Internet Options
Click on Delete History button.
Make sure all check boxes are checked, then click Delete.
Once that is done, close IE, then try your code again in IE.