Some help - browser and pages problems

Hi,

I am the administrator of this website : cre-se.net and I really have some problems right now.
what are the problems:
1) Internet Explorer and Mozilla Firefox does not show the background gradient, while when I am using Google Chrome it works properly.
2) I have a problem with the pages. The width of pages is less than it is normal and all content located in these pages has a link to the homepage. I did not set up one. In Internet Explorer the bug does not appear.

I hope you could help me!
Grade

Current Link with background image.

I have created a class for my links which applies only to the current page. The font style remains, but the background image only appears when you hover over it. Can anyone see what I have done incorrectly with my text and help me fix this problem?

CSS:

a{
	font-family:Arial,Helvetica,sans-serif;
	color:#034EA2;
	font-size:14px;
}
a:hover{
	font-weight:bold;
	color:#034EA2;
}
a.active{
	color:#034ea2;
	font-weight:bold;
	font-family:Georgia, "Times New Roman", Times, serif;
	}
body{
	margin:auto;
	height:900px;
	width:1024px;

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