Introduction to common properties in css3

RGBA

background：rgba(0, 118, 160, .25);

The first three values ​​are the RGB color values ​​and the last value is the level of transparency (0 = transparent, 1 = opaque).

RBGA can be applied to any color-related properties such as font color, border color, background color, shadow color, etc.

Text Shadow text-shadow (No need to judge the browser)

text-shadow:2px 3px 2px #000;

The structure of the text shadow is in the following order: X-offset, Y-offset, blur, and color;

text-shadow:-2px -3px 2px rgba(0, 118, 160, .25);

Set to a negative value, the X-Offset shadow shifts to the left. Set Offset Y to a negative value - Shifts the shadow to the top. Colors can use RGBA values.

text-shadow:0px 1px 0px #fff,0px -1px 0px #000；

List of text shadows (comma separated), 1px top and 1px bottom shadow.

Box-shadow box-shadow (need to determine the browser)

The structure of the box shadow is the same as that of the text shadow: respectively marked: X - Offset, Y Offset, Blur and Color.

-webkit-box-shadow:5px 5px 7px #333;
-moz-box-shadow:5px 5px 7ix #333;

Similarly, multiple shadow styles can be defined, separated by commas.

moz-box-shadow:
-2px -2px 0 #fff,
2px 2px 0 #bb9595,
2px 4px 15px rgba(0, 0, 0, .3);

The box-shadow attribute has up to 6 parameter settings:

Shadow type: This parameter is an optional value. If no value is set, its default projection The method is outer shadow; if its unique value "inset" is taken, the outer shadow will be turned into an inner shadow. That is to say, when the shadow type is set to "inset", its projection will be an inner shadow;

X-offset : refers to the horizontal offset of the shadow. Its value can be positive or negative. If the value is positive, the shadow is on the right side of the object. Otherwise, when the value is negative, the shadow is on the left side of the object;

Y-offset: refers to the vertical offset of the shadow. Its value can also be positive or negative. If it is a positive value, the shadow is at the bottom of the object. Otherwise, when its value is negative, the shadow is at the top of the object. ;

Shadow blur radius: This parameter is optional, but its value can only be positive. If its value is 0, it means that the shadow has no blur effect. The larger the value, the smaller the edge of the shadow. The blurrier it is;

Shadow expansion radius: This parameter is optional, and its value can be positive or negative. If the value is positive, the entire shadow will be extended and expanded, otherwise if the value is negative, the shadow will be reduced

Shadow color: This parameter is optional. If no color is set, the browser will use the default color, but the default color of each browser is different, especially the safari and chrome browsers under the webkit kernel will be colorless. , that is, transparent, it is recommended not to omit this parameter.

Box border radius border-radius (need to determine the browser)

The abbreviation of border radius is similar Padding and Margin properties (eg border radius: 20 pixels).

To render the border radius in the order of the browser, use "-WebKit-" in WebKit browsers and "-moz-" in Firefox.

border-radius:20px;
-webkit-border-radius:20px;
-moz-border-radius:20px;

You can specify a different value for each corner. Note that Firefox and Webkit Angular have different property names.

How to write "Webkit"

-webkit-border-top-left-radius:5px;
-webkit-border-top-right-radius:15px;
-webkit-border-bottom-left-radius:25px;
-webkit-border-right-left-radius:45px;

How to write "Firefox"

-moz-border-radius-topleft:5px;
-moz-border-radius-topright:15px;
-moz-border-radius-bottomleft:25px;
-moz-border-radius-bottomright:45px;

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