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Why is the div not centered?

I'm trying to center this element on the screen, also when I hover.

In the example below, the div is not centered, even when I hover it, knowing that I have a 50% transform and the top/left is also transformed, this is what I use to center the element Commonly used methods. 

* {
  box-sizing: border-box;
}
body {
position: relative }

.zoom {
  padding: 50px;
  background-color: green;
  transition: transform .2s;
  width: 200px;
  height: 200px;
  margin: 0 auto;
  
  transform: scale(.2) translate(-50%, -50%);
  position: absolute;
      top: 50%;
    left: 50%;
}

.zoom:hover {
  -ms-transform: scale(1.5); /* IE 9 */
  -webkit-transform: scale(1.5); /* Safari 3-8 */
  transform: scale(1.5); 
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
 
</head>
<body>
 
<div class="zoom"></div>

</body>
</html>

P粉805922437P粉805922437301 days ago387

reply all(2)I'll reply

  • P粉211600174

    P粉2116001742024-02-05 07:00:08

    The error is in the :hover selector because there is no translate() in the transform, you are basically resetting it to 0, which is not what you want. Because it will forget the previous content and overwrite it.

    Here’s a simple solution:

    ❌

    .zoom:hover {
  transform: scale(1.5); 
}

    ✅

    .zoom:hover {
  transform: 
     scale(1.5)
     translate(-50%, -50%); /* add this */
}

    Here’s a simple explanation:

    Modern solution (less code):

    Using CSS Grid https://developer.mozilla.org/ en-US/docs/Web/CSS/grid

    Use place-items It will automatically center without any transform or position... https://developer.mozilla.org/en-US/docs/Web/CSS/place -items

    Also, you don't have to scale 0.2 at the beginning, just start with scale(1) and make it larger by hovering for a larger scale, For example 4. (So ​​without any hover it won't produce that error at the beginning of the transition from 200px to 0.2scale)

    However, if you want the CSS to work in IE and older browsers, it's better to use position, pan, top, left...

    But your users are using modern browsers, so for better readability and simplicity it might be a good idea to use Flexbox or Grid.

    For more information, use https://caniuse.com (e.g. Grid is 95% supported in any browser starting in 2020, Chrome starting in 2017)

    Here is the CSS grid solution

    html,
body {
  height: 100%;
}

body {
  display: grid;
  place-items: center;
  margin: 0;
}

.zoom {
  background-color: green;
  width: 50px;
  height: 50px;
  transition: transform 0.2s;
}

.zoom:hover {
  transform: scale(4);
}

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    0
  • P粉797855790

    P粉7978557902024-02-05 00:44:14

    Remember that the order of transformations determines how elements are displayed. You start by moving the element top: 50%; left: 50%;, placing it in the lower right quadrant. Then you make it smallertransform:scale(0.2) thenThenyou move it to the left now smaller sizetranslate(-50%, -50%)# 50% of ##.

    By putting the translation first, the element will

    be centered before becoming smaller. Remember, when you increase the size, also include translate(-50%, -50%) as subsequent translations will overwrite the current translation instead of being added to in. 

    * {
  box-sizing: border-box;
}
html, body {
  height: 100%;
}
body {
position: relative }

.zoom {
  padding: 50px;
  background-color: green;
  transition: transform .2s;
  width: 200px;
  height: 200px;
  margin: 0 auto;
  
  transform: translate(-50%, -50%) scale(.2);
  position: absolute;
      top: 50%;
    left: 50%;
}

.zoom:hover {
  -ms-transform: translate(-50%, -50%) scale(1.5); /* IE 9 */
  -webkit-transform: translate(-50%, -50%) scale(1.5); /* Safari 3-8 */
  transform: translate(-50%, -50%) scale(1.5); 
}

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    0
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