Some common sense about css background

1. How to set the background color of the label
There is a background-color: attribute in css, which is The

value specially used to set the background color:
Specific words
rgb
rgba

Hex

2. How to set the background image?
There is a property called background-image in css, which is specially used to set the background image.

Notes:
1. The address of the picture must be placed in url(). The address of the picture can be a local address or a network address.
2. If the picture The size is not as large as the label, so it will be automatically tiled and filled horizontally and vertically
3. If an image appears on the web page, the browser will send a request again to obtain the image

##3. How to control the tiling of background images?
There is a background-repeat attribute in css, which is specially used to control the tiling method of background images.

Value:
repeat Default, tile both horizontally and vertically
no-repeat Tile neither horizontally nor vertically
repeat-x Tiles in the horizontal direction
repeat-y Tiles in the vertical direction

Application scenarios:
You can reduce the size of the image and improve the access speed of the web page by tiling the background image

4; How to control the position of the background image?
There is a background-position attribute in css, which is specially used to control the position of the background image

2. Format
background-position: horizontal direction vertical direction;

3. Value
3.1 Specific position noun
Horizontal direction: left center right
Vertical direction: top center bottom

##3.2 Specific pixels
For example: background-position: 100px 200px;
Be sure to write the unit, that is, px
Specific pixels accept negative numbers

Note:
The same tag can set the background color and background image at the same time. If the color and the image exist at the same time, the image will overwrite the color

5. Format of background attribute abbreviation
background : Background color, background image tiling method, association method, positioning method;

2. Note that any attribute in the background attribute can be omitted
3. What is the association method?

By default, the background image will scroll as the scroll bar scrolls. If you don’t want the background image to scroll as the scroll bar scrolls, then we can modify the association between the background image and the scroll bar. Method
4. How to modify the background association method?

There is a background-attachment attribute in css that specifically modifies the association of the background
Format

background-attachment: scroll;
Value
scroll Default value, will scroll as the scroll bar scrolls
fixed will not scroll as the scroll bar scrolls The scrolling of the bar

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