Image width processing problem_html/css_WEB-ITnose

There is a picture with a pixel size of 1920X500. Please tell me how it can be displayed vertically and centered on screens with different resolutions such as 1920, 1280, 1024, etc. For example, on a 1024 resolution screen, only the width of 1024 in the middle of the picture is displayed, and the height is 500. Please tell me.

Reply to the discussion (solution)

I remember seeing an example before (I forgot where), where the background image was set through js Position, the calculation formula seems to be to set the vertical coordinate of the picture to half the height of the screen minus half the height of the picture. Can you try it?

I remember seeing an example before (I forgot Where is it), the position of the background image is set through js. The calculation formula seems to be to set the vertical coordinate of the image to half the height of the screen minus half the height of the image. If you try it, you can achieve different results

I'm a newbie and not familiar with JS. Could you please give me an example? Thank you!

I don’t know how basic your css is. . . Here you need to use css and js together
1. First, the image must be absolutely positioned
position:absolute;
2. Then the left offset of the image is 50%
left:50%;
At this time, you will find that the image will be skewed to the right
3. Add left margin
3.1 If your image has a fixed width of 1920, add a margin-left
to the image margin-left:-960px;
3.2 If your image is not of fixed width, you need to use js to add margins (the principle is to get the width of the image, and then the left margin is half the negative width)
document.getElementByTagName("img").style.marginLeft= -(document.getElementByTagName("img")[0].width/2) "px";

I don’t know how basic your CSS is. . . Here we need to use css and js together
…………

I am also new to CSS

Can any expert give a detailed example? I’m just getting started with CSS and I don’t know JS! ! !