Umbraco css folder always modifying files in background without me touching them

I have a GIT repository and I'm using Umbraco. Once strange thing that was happening to me were my files in the css folder kept on being modified even though I wasn't changing them. So every time I wanted to commit a change I'd have to undo the css file changes.

I thought this was Umbraco and because I had my style sheet linked to the rich text editor datatype, but it turned out to be the uSync package. I was synchronizing Stylesheets so by turning this off in the uSyncSettings.config file this stopped the problem. I don't need uSync to manage these files for me.

What is *.htc with CSS styling?

IE also supports so called behaviors; .htc or .hta files that can be attached to specific elements using css making it possible to let these elements behave in a special way.

To read more and find examples have a look at this link:whatever:hover

Opacity with CSS

Below is an example of HTML that displays a list and when you hover over the element a fade is placed over the div:

The style sheet entry looks like this (notice the other style name that is not used above archive-results-list):

ul.search-results-gallery li div:hover,
ul.archive-results-list li div:hover{
filter:alpha(opacity=85);
-moz-opacity:0.85;
opacity:0.85;
}

The use of important in CSS

!Important is used to give priority to element properties. Read this article and it all makes sense:

http://www.yellowjug.com/web-design/the-importance-of-important-in-css/

An important thing to notice is the use of min-width and max-width parameters to control width.