centering ruler

We know that there are elements in the CSS that are horizontally and vertically centered, and that it is simple to center the elements horizontally:If it is an inline element, Text-algin:center is used for its parent element and Margin:auto is used if it is a block-level element.But it is not so good to mention the vertical center of the element. Especially when the element size is not fixed, it is more difficult to deal with.HTML code:CSS code:margin:0 Auto; Text-align:center; Wh

Problem description: To a DIV often encounter want it vertical center, generally how do you realize it? The cake collects 6 methods (?? ω??) YMethod OneThe vertical centering method for textLine-height:parent-wrapper-height;text-align:centerThis should be more common, for like P tags, if there is only one line of text, you can use it higher than the height of the container, but if it is more than one line of the method is unreliable.Method TwoAlready

Just started to contact HTML5, ready to write some Web pages, but the process of learning encountered the picture can not center the problem, first to see, code and execution effect:1 DOCTYPE HTML>2 HTML>3 4 Head>5 The following line of code to calibrate the encoding method, in order to prevent in some browsers the problem of Chinese garbled -6 MetaCharSet= "Utf-8">7 title>Picture centering problemtitle>8 9 Head>Ten One Body> A - img

We often use margin:0 auto to achieve horizontal centering, and always think that margin:auto can not be vertically centered ... In fact, implementing vertical centering requires only declaring the element height and the following CSS:. absolute-center {Margin:auto; Position:absolute;top:0;left:0;bottom:0; right:0; }Center around Bottom:. Absolute-bottom {Margin:auto; Position:absolute;top:0; left:0; right:

Fixed high-width div vertically centeredFor example, the fixed high-width is very simple, the wording is as follows:1 Position:absolute; 2 left:50%; 3 top:50%; 4 width:200px; 5 height:100px; 6 margin-left:-100px; 7 margin-top:-50px;How to vertically center a high-width div without fixing itMethod one (this div element should be Inline-block):Using a "ghost" pseudo-element (invisible pseudo-element) and Inline-block/vertical-align can be settled in, very ingenious. But this method requires that t

CSS in the center, in the work, will often encounter. It can be divided into horizontal center and vertical center, here are several ways to achieve the center.git View SourceWorks better with online previewsIn the following example, the value of the CSS property is involved. .parent-frame { width: 200px; height: 200px; border: 1px solid red; } .child-frame { width: 100px; height: 100px; border: 1px dotted blue; }1:text-align:center, Horizontal CenterBlo

-center { width: 50px; height: 50px; margin: calc (50%-25px)/* because the percent value of margin is calculated relative to the width of the parent element, Therefore the method only applies to the parent container with the same width and height */} Four, Flex Block elements and floating elements. Block { display: flex; min-height50vh; } . Block-center{ marginauto; } inline element (add to outer parent element). Inline { display: flex; m

1. Centering with absolute positioning1 is too limited to set top/bottom and height or left/right with width. 3 Absolute alignment principle: When the element is over-constrained, the margin is set to auto, and the browser calculates the value of the margin, which is too restrictive to set top/bottom and height or left/right and width at the same time.1. absolute_center{position:absolute; width:200px; height:200px; top:0; bottom:0; left:0; right:0

3, the center of the multi-line text fixed height, principle,:Parent element style: display:table;height:400px;child element style: Vertical-align:middle;display:table-cell;Internet Explorer 6,7 does not correctly understand display:table and Display:table-cell,Internet Explorer 6,7 and the following versions are not validInternet Explorer 6,7 does not correctly understand display:table and Display:table-cell,Internet Explorer 6,7 and the following versions are not valid Compatible with Internet

the original height. For example, we set the position of Subwrap to 40%, we must set the top:-80% if we want to overlap the top edge of the content with wrap, so if we set the top:50% of Subwrap, we must use 100% To get the content back to its original location, but what if we set the content to 50%? So it's just vertically centered. So we can use this method to achieve vertical centering in Internet Explorer 6: P#wrap { border:1px solid #F

: inline-block; vertical-align: middle; Note:600px must be the height of the parent element, it is also important to note that Font-size should be set to zero, if the property is not written, it will cause the element not to be precisely vertically centered. This method is the method I answered during the interview, the disadvantage is obvious, the parent element height must be determined. (Compatible with ie8+) Second, Table-cell Center method Parent element:display: table-cell; text-align: cen

In addition to the special instructions, the content of this site using Creative Commons authorized signature and non-commercial use, please respect the fruits of labor. Original title: Vertical centering in CSS Subtitle: Yuhu ' s definitive solution with Unknown Height Translation: Forestgan Despite the vertical-align features of CSS, it is not possible to solve the problem of vertical centering of unknow

Multi-line text with parent element height determination (method one)There are two ways that the parent element determines the vertical centering of multiple lines of text, pictures, and so on:1. Use the Insert table (including TBODY,TR,TD) tab and set the Vertical-align:middleTable Tb{height:500px;background: #ccc}Because TD labels are set by default to Vertical-align to middle, you do not need to set2. Multi-line text with height determination of pa

1. Horizontal center Setting-inline elementSet 1 text-align:center by parent element, to center the contents of the parent element2. Horizontal centering Setting-Fixed width block elementThe width of the block element is fixed, and the center is achieved by setting the left and right margin value "auto".Example:3. Horizontal Center Setting-variable width block elementMethod 1. Add Table labelExample:1 DOCTYPE HTML>2 HTML>3 Head>4 MetaCharSet= "Utf-8"