scroll - CSS: background image does not fill when scrolling

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scroll - CSS: background image does not fill when scrolling

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scroll - CSS: background image does not fill when scrolling

working on a very small site which loads in one go, so there is a div which holds all the background images, and on top of that (i.e. higher z-index) there is a content div which holds everything. I can switch backgrounds easily based on what content is selected.

Unfortunately, I noticed if you launch in a small window so that scrollbars appear, if you scroll there is no background image in the 'revealed' portions of the page. :-(

Page structure:

<body>
<div id="bg">
    <div class="bgone"></div>
    <div class="bgtwo"></div>
</div>

<div id="container">
<!-- content panels here -->
</div>
</body>

css:

#bg
{
    margin: 0px;
    position: absolute;
    top: 0px;
    left: 0px;
    width:100%;
    height: 1024px;
    z-index:1;
}
.bgone
{
    margin: 0px;
    position: absolute;
    width:100%;
    height: 1024px;
    background-image:url(../images/one.jpg);
    background-position:top;
    background-repeat:repeat-x;
    z-index:2;
}
.bgtwo
{
    margin: 0px;
    position: absolute;
    width:100%;
    height: 1024px;
    background-image:url(../images/two.jpg);
    background-position:top;
    background-repeat:repeat-x;
    z-index:3;
}
#container
{
    position:relative;
    width:900px;
    padding:0px;
    margin:0px auto;
    height:600px;
    z-index:10;
}

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1 Reply

深蓝 · Answer 1 · 2021-10-17T01:06:53+0000

I had the same problem and it is annoying. Problem for me was that I could not change the HTML, only the CSS, so I couldn'y remove the additional divs.

The problem as I see it is that the backgrounds have "width: 100%" and the container has "width: 900px". So, for example, if the browser window is 800px wide, the backgrounds are set to 800px and, therefore, when you scroll the window horizontally, you get the areas without the background.

Another way to fix the problem is to remove the "width: 100%" from the backgrounds and replace it with a "min-width: 900px", thus forcing the backgrounds to be always at least the same width as the container. When the window size becomes less than 900px, the backgrounds always remain at the same with as the container. Works a treat.

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scroll - CSS: background image does not fill when scrolling

scroll - CSS: background image does not fill when scrolling

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