Detailed explanation of the background attribute of css style

background Detailed explanation of usage:

1, background-color AttributeSet the background color of the element

Possible Value

color_name Specifies that the color value is the background color of the color name (such as red)

hex_number Specifies that the color value is a hexadecimal value Background color (such as #ff0000)

rgb_number Specifies that the color value is the background color of the rgb code (such as rgb(255,0,0)

transparent The default background color is transparent

2, background-image The attribute sets the background of the elementImage

Possible values

Single background image: background-image:url(a.png)

Multiple background images: background-image:url(a.png),url(b.png)

Linear Gradient: background-image:-webkit (-repeating)-linear-gradient(direction, color value in pixels or percentage, color value in pixels or percentage...)

                Direction :left, right,top,bottom,90deg,180deg

                  Color value pixels or percentage: yellow 10%, transparent 4px, rgb(0, 0,0) 2px

Radial gradient: background-image:-webkit(-repeating)-radial-gradient([position> || ,]? [ || ,]? , [, ]*)

                                  -position>: The default is center

                                                                                                                                          ’ ‐ ’ s ’ s ’s ’ s ’ s ’ s ,                                                              to cover

3,

background-size

attributes are used to reset the size of the background image contain: shrink the background image to fit the label element

cover: The background image is enlarged and extended to the entire label element size

Pixels: Indicates the size of the background image scaling

Percentage: The percentage is based on the size of the content label element to scale the size of the image

4,

background-position

The attribute is used to set the background image position Possible values: left, right, top, bottom, center, pixels, percentage

5 ,

background-repeat

attribute is used to set the background image position Possible values: repeat,repeat-x,repeat-y,no-repeat,space (will not be cropped or resized ), round (will not be cropped but will change the image size)

6,

background-attachment

attributes are used to set whether the background image can be scrolled Possible values: scroll, fixed

7,

background-clip

attributes are used to specify the drawing area of ​​the background Possible values: b

ord

er-box,padding-box,content-box8,

background-origin

attributes are used to specify the position relative to which the background-position attribute is positioned Possible Value: border-box, padding-box, content-box

Extension: draw square

html code

<p>使用背景绘制方格，使每个文字都在方格里，效果图如下。</p>

css code

p {
     width: 300px;
     height: 300px;
     border-left: 3px solid pink;
     border-top: 3px solid pink;
     background-image: -webkit-linear-gradient(180deg, pink 3px, transparent 3px) , -webkit-linear-gradient(90deg, pink 3px, transparent 3px);
     background-size: 30px;
     line-height: 30px;
     font-size:25px;
     letter-spacing: 5px;
}

result

Use the background to draw a square grid so that each text is in the square grid. The rendering is as follows.

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