A Practical Guide to Tips and Tricks for Fixed Positioning Properties in CSS

To master the tips and tricks of the positioning attribute of fixed positioning in CSS, you need specific code examples

Fixed positioning in CSS is a special positioning method that makes Elements are positioned relative to the browser window. In web design, this positioning method is often used to create elements that are adsorbed to a certain location on the page and do not scroll with the scroll bar, such as navigation bars or advertising columns. This article will introduce the positioning attributes of fixed positioning, including commonly used attribute values, as well as code examples.

First of all, the calculation basis for fixed positioning is the viewport of the browser window, which is not affected by the document flow. The following are the commonly used fixed positioning properties in CSS:

1. position: fixed

   • This is the basic property of fixed positioning, which positions the element relative to the browser window. position.

   • Sample code:

     .navbar {
     position: fixed;
     top: 0;
     left: 0;
     width: 100%;
     }

2. top, bottom, left, right

   • These attributes are used Adjusts the distance between an element and the edge of the window to determine its position.

   • Sample code:

     .ad-banner {
     position: fixed;
     top: 20px;
     right: 20px;
     }

3. z-index

   • This attribute is used to control the position of the element. Display hierarchy in stacking order, elements with higher z-index values ​​will be displayed above other elements.

   • Sample code:

     .modal-dialog {
     position: fixed;
     top: 50%;
     left: 50%;
     transform: translate(-50%, -50%);
     z-index: 9999;
     }

4. overflow

   • When the content of a fixed positioned element exceeds the view window , use the overflow attribute to control how overflow content is displayed.

   • Sample code:

     .sidebar {
     position: fixed;
     top: 0;
     left: 0;
     width: 200px;
     overflow-y: auto;
     }

5. transform

   • This property can be transformed by translation, rotation and scaling Such operations adjust the position and size of elements, and are often used to fix the centered layout of positioned elements.

   • Sample code:

     .modal-dialog {
     position: fixed;
     top: 50%;
     left: 50%;
     transform: translate(-50%, -50%);
     }

These tips and tricks can help us better master the positioning properties of fixed positioning in CSS. By adjusting the values ​​of these properties, we can flexibly achieve various effects of adsorbing on the page and not scrolling with the scroll bar.

Whether you are creating a navigation bar, advertising column or dialog box, fixed positioning is a very practical technology. We hope that the code examples provided in this article can help readers better understand and use fixed positioning positioning properties. Mastering these skills, we can use fixed positioning more flexibly in web design to achieve various attractive effects.

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