SilverOrchid Theme problem

My site is chocolatecity.cc and my environment is WordPress 3.7 (problem existed prior to 3.7 upgrade) with SilverOrchid/Child-theme @ 1.5.0. I have been struggling with couple of issues:

1. Despite adding the below code in my child-theme’s css stylesheet to create a sidebar of 300px, it doesn’t appear to be working:

#sidebar {
width: 300px;
float: left;
margin-top: 10px;
overflow: hidden;
}

2. Displaying my site in Internet Explorer is not rendering the tables/columns properly; any suggestion?

Thanks