css - background-image doesn't appear if <div> is empty?

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css - background-image doesn't appear if <div> is empty?

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

css - background-image doesn't appear if <div> is empty?

I created a <div> first thing in the <body> to draw a top line at the top of the page:

<body>
    <div class="bordertop"></div>
    .....
</body>

and the style:

body {
    font-family: Helvetica, Arial, sans-serif;
    -webkit-text-size-adjust: 100%;
    margin:0;
}
.bordertop {
    background-image: url(../images/top_border.png);
    background-repeat: repeat-x;    
}

However, the top_border image doesn't appear unless I write some text inside the <div> but I don't want to. How could I fix this?

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1 Reply

深蓝 · Answer 1 · 2021-10-17T03:08:57+0000

Since the div is empty, there's no content to push it "open" leaving the div to be 0px tall. Set explicit dimensions on the div and you should see the background image.

.bordertop 
{
    background-image: url(../images/top_border.png);
    background-repeat: repeat-x;    
    height: 100px;
    width: 100%; /* may not be necessary */
}

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css - background-image doesn't appear if <div> is empty?

css - background-image doesn't appear if <div> is empty?

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