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This article introduces the relevant knowledge of "how to make css the highest element level". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

In CSS, you can use the "z-index" attribute to make the element the highest level. The role of this attribute is to set the stacking order of the elements. The elements with higher stacking order will always be in front of the elements with lower stacking order, that is, the element has the highest level. The syntax is "element {z-index:number;}".

Operating environment of this tutorial: Windows 10 system, CSS3 && HTML5 version, Dell G3 computer.

CSS How to make the highest element level

Control elements are at the top level and can be set via the z-index attribute in CSS. Here is an example of how CSS styles control div to the top level, using a three-layer div.

1. Create a new html file named test.html to explain how CSS styles control div to the top. Use css to set all div width to 300px, height to 300px, div position to absolute positioning.

Create three div's and identify them with text: the bottom div, the middle div, and the topmost div. Set the class attribute to one, two, and three for the three divs respectively, which are used to style the class names below.

Set a div style with class name one, background color red, 0 from the left edge of the page, 0 from the top edge of the page, and level 1 with z-index.

2. In the CSS tag, set the div style with class name two, set its background color to yellow, 50px from the left edge of the page, 50px from the upper edge of the page, and set its level to 2 with z-index, that is, above the div with class name one.

Set the div style with class name three, set its background color to pink, 100px from the left edge of the page, 100px from the top edge of the page, and set its level to 3 using z-index, which is the top of the three divs on the page.

Open the test.html file in your browser to see the hierarchy effect.

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