Troubleshooting: Fixed Header Issue in HTML5 Responsive Web Design

My goal is to develop a simple HTML5 responsive web layout with a fixed header. I am striving to maintain clean HTML and CSS code while adhering to best practices. The header is designed to have a maximum width of 980 pixels, with a blue background that expands to fill the window. However, I am encountering a few issues in my CSS (and potentially my HTML) that are causing the header to overlap the content below it. Additionally, the blue background of the header is not extending to the left of the window, and I am struggling to vertically center the logo image within the header. Despite spending the entire night tinkering with the code, I have been unable to resolve these issues.

Fiddle: http://jsfiddle.net/DU3D6/

CSS

    * { margin: 0; padding: 0; }

p { margin: 0 0 10px; line-height: 1.4em; font-size: 1.2em;}

#wrapper {
    width: 100%;    
    max-width: 980px;
    margin: auto;
} 

header {
    background-color: blue;
    width: 100%;
    height: 100px;
    top: 0px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    position: fixed;
}

#logo {
    height: 70px;
    width: 160px;
    float: left;
    display: block;
    background: url(logo.png) 0 0 no-repeat;
    text-indent: -9999px;
}

HTML

<div id="wrapper">
<header>
<a href="#" id="logo">Logo</a>
</header>
<section id="main">
<h1>Main section</h1>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</section>
</div>

I have made necessary amendments and re-posted this text with updated tags.

htmlcss

Answer №1

If you want to adjust the alignment of the header, you can remove the margin-left and margin-right properties and set the left position to zero. If the image is not displaying in the JSFiddle due to a relative link, you can align it to the left within a 980px centered block by nesting another div inside the header with a width of 980px and centering it.

To prevent the header from covering the content initially, you can add a top margin that is larger than the header, such as 110px.

http://jsfiddle.net/A4atq/

* { margin: 0; padding: 0; }

p { margin: 0 0 10px; line-height: 1.4em; font-size: 1.2em;}

#wrapper {
    width: 100%;    
    max-width: 980px;
    margin: auto;
} 

header {
    background-color: blue;
    width: 100%;
    height: 100px;
    top: 0px;
    left: 0;
    display: block;
    position: fixed;
}

#logo {
    height: 70px;
    width: 160px;
    float: left;
    display: block;
    background: url(logo.png) 0 0 no-repeat;
    /* text-indent: -9999px */;
}

section#main {
    margin-top: 110px;
}
}

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