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Detailed explanation of CSS to realize adaptive full-screen web page background image

小云云

Feb 07, 2018 am 09:12 AM

cssBackground picture

This article mainly introduces to you the relevant information on the CSS method of realizing adaptive full-screen web page background images. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

Web page background adaptive full screen.PNG

A clear and beautiful background picture can add a lot of points to the web page, and designers often add it to the page. Use a large image for the background. We don’t want the image to be deformed due to different resolutions, nor do we want the background to be exposed when the screen is large. In short, we want to achieve an image that can adapt to the screen size without deforming. The background image is large, and the background image will not scroll as the scroll bar scrolls.

The following is how to implement it with CSS:

HTML:

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <title>title</title>
</head>
<body>
<p class="wrapper">
    <!--背景图片-->
    <p id="web_bg" style="background-image: url(./img/bg.jpg);"></p>
    <!--其他代码 ... -->
</p>
</body>
</html>

CSS:

#web_bg{
  position:fixed;
  top: 0;
  left: 0;
  width:100%;
  height:100%;
  min-width: 1000px;
  z-index:-10;
  zoom: 1;
  background-color: #fff;
  background-repeat: no-repeat;
  background-size: cover;
  -webkit-background-size: cover;
  -o-background-size: cover;
  background-position: center 0;
}

Next, let’s analyze the function of each line of code in css:

  position:fixed;
  top: 0;
  left: 0;

These three lines make the entire p fixed on the screen. The top and leftmost

width:100%;
height:100%;
min-width: 1000px;

The first two sentences above are to make the entire p the same size as the screen, so as to achieve the full-screen effect, and min-width is to achieve the When the screen width is within 1000px, the size of p remains unchanged, which means that in this case, when scaling the screen width, the image does not scale (only valid within 1000px).

z-index:-10;

The purpose of this is to make the entire p below each level in the HTML page. Under normal circumstances, the z-index value of the first created level is 0. So if we write -1 here, it can also be achieved, but writing -10 here is to ensure that the entire p is at the bottom, because if there are too many levels in the page, sometimes using -1 may not necessarily be at the bottom, but if it is written as -100 Such large numbers are meaningless. Use index:-10 to achieve what looks like a background image. It is actually the most common p, but the hierarchical relationship has changed to make it look like a background image.

background-repeat: no-repeat;

The above is the background, don’t repeat it

background-size: cover;
-webkit-background-size: cover;
-o-background-size: cover;

The above three sentences have the same meaning, which is to let the picture follow the screen The size is synchronously scaled, but some parts may be cropped, but it will not be exposed. The following two sentences are for compatibility with Chrome and Opera browsers.

background-position: center 0;

The above sentence means the position of the picture, centered and aligned to the left.

Related recommendations:

CSS3 tutorial (5): Web page background image_css3_CSS_Web page production

JS realizes the web page background image Method of moving diagonally_javascript skills

Full-screen setting of web background image_html/css_WEB-ITnose

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