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This article mainly introduces "how to move the box down as a whole by html". In the daily operation, I believe many people have doubts about how to move the box down as a whole by html. The editor has consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the questions of "how to realize the overall downward movement of the box by html". Next, please follow the editor to study!

First, known size box; left and right center

1. Use positioning and pull left and right:

Html:

Css:

.box {width: 300pxash height: 300pxscape border: 1px solid orange;position: relative;}

.child {width: 100pxposition height: 100pxposition border: 1px solid blue;position:absolute;left: 50% position top: 50% marginal left:-50px position margin top:-50px;}

2. Use margin:auto by:

Html:

Css:

.box {width: 300pxash height: 300pxscape border: 1px solid red;position: relative;}

.child {width: 100pxtransferheight: 100pxblown border: 1px solid green;position:absolute;left: 0Tractop: 0Traceright: 0Tracebottom: 0politics margin: auto;}

Second, the unknown size box is centered around the left and right

1. The displacement method is used, the compatibility is low, and the mobile end should be used with caution.

Html:

Css:

.box {width: 300pxash height: 300pxscape border: 1px solid red;position: relative;}

.child {width:auto;border: 1px solid green;position:absolute;left: 50% chatter top: 50% transformtransformtranslate (- 50% maxim 50%);-webkit-transform: translate (- 50% conjure 50%);-moz-transform: translate (- 50% Lindi 50%);-ms-transform: translate (- 50% meme 50%);-o-transform: translate (- 50% meme 50%);}

2. Combine display:table-cell with vertical-align and text-align to center all elements in the parent element horizontally and vertically (internal div can be set to display:inline-block).

Html:

Css:

.cell {

Display: table-cell

Vertical-align: middle

Text-align: center

Width: 240px

Height: 180px

Border:1px solid # 666

}

3. Use elastic layout to realize vertical left and right center.

Html:

Css:

* {

Margin: 0

Padding: 0

}

.wrap {

Width: 100px

Height: 100px

Border: 1px solid # 000

Margin: 3.125em auto

Display: flex

Justify-content: center

Align-items: center

}

.in {

Width: 10px

Height: 10px

Background: # 000

Border-radius: 50%

}

Display:flex; sets .wrap to elastic layout

Justify-content:center; defines that the project is centered on the principal axis (horizontal)

Align-items:center; defines that the project is centered on the cross axis (vertical)

The img element is centered in div:

The first method:

Step 1: add a span element after the img tag

Step 2: style these elements

1. Set the # div1 element to text-align:center

two。 Convert the added element span to an inline block element (display:inline-block), and set the vertical-align:middle

3. Set the vertical-align:middle for the img element.

After completing the above operation, the Img element is centered vertically in # div1. The compatibility of this method is better, and the only disadvantage may be to add an element after the element.

(note: this element is preferably a span element. If it is a div element, there is a compatibility problem in the lower version of ie)

The second method:

This method takes advantage of the new features of css3.

Set display:flex;vertical-align:middle;align-items:middle for # div1.

The disadvantage of this approach is that as long as browsers that don't support css3, it won't work.

At this point, the study on "how to move the box down as a whole by html" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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