The problem of box-shadow conflicting with fluid width layouts has been a persistent issue,

After spending the past couple of days refining a page I created, I've encountered an issue following the implementation of box-shadow. I'm hoping someone can provide some advice on how to easily resolve this.

The Scenario: I have a div with various properties, including width, max-width, and box-shadow.

#mydiv {  
       width:100%;
       max-width:1200px;
       -webkit-box-shadow: 0px 0px 20px rgba(0, 0, 0, 1);
       -moz-box-shadow: 0px 0px 20px rgba(0, 0, 0, 1);
       box-shadow: 0px 0px 20px rgba(0, 0, 0, 1);
}

The Issue: The "box-shadow" property is causing the div element to increase in width by 40px - 20px on each side. This results in a horizontal scroll-bar when the content should fit within the 100% width specification. Upon reviewing the CSS, I realized that the div was essentially being treated as width: 100% + 40px;

Possible Solutions Tried: I contemplated setting overflow:hidden on the parent div, but my min-width restriction would make the content unreachable. I also attempted using a percentage for the size attribute in the box-shadow CSS - such as 1% - and then adjusting the div's width to 98%, but it appears that the box-shadow CSS does not support percentage values for its size. Another option considered was employing JavaScript to assess the browser width and show or hide the box-shadow component accordingly, although this doesn't seem like the most efficient approach.

There must be a simpler method to address this dilemma. Any suggestions?

Answer №1

It seems to be a bug within the browser.

The specification used to lack clarity on this issue, but has since been updated to specify that shadows should not trigger scrolling:

Shadows do not cause scrolling or expand the scrollable area.

However, due to this initial oversight, most browsers actually did cause scrolling for shadows. Fortunately, recent browser versions have addressed this issue.

In older browsers, you may need to deal with scrollbars, apply overflow-x: hidden to your #mydiv (with caution), or explore alternative methods for adding shadows such as using traditional PNGs.

For more insights, check out the following related questions:

  • Firefox & CSS3: using overflow: hidden and box-shadow
  • CSS box shadow on container div causes scrollbars

Answer №2

Dealing with scroll bars in fluid width sites that have box shadows can be tricky.

One solution is to use @media queries in your CSS to determine when the browser window reaches a certain width (most modern browsers support this functionality, including IE9).

For instance, if you have a centered pagewrap div with a max-width of 940px, you could include the following in your stylesheet:

@media screen and (min-width: 998px) { div#pagewrap { -moz-box-shadow: 3px 8px 26px #a1a09e; -webkit-box-shadow: 3px 8px 26px #a1a09e; box-shadow: 3px 8px 26px #a1a09e; } }

The min-width value of 998px in the @media query ensures that the drop shadow disappears just before the scroll bar would appear.

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