CSS Fixed Header [closed]

Answer 1

A simple typo in your position - you want fixed not fixes.

.header{
     width: 100%;
     position:fixed;
     top: 0px;
}

Answer 2

It looks like your code is good. You may try to inspect the element using firebug addon and see any conflict there.You can also try to add height , if still not solve then you can take a look sticky header article that explain process of making it.

.header{
 width: 100%;
 position:fixed;
 top: 0px;
 height:50px;
}