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There are several categories of shadows in css3

青灯夜游

Release： 2022-03-18 17:51:55

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Shadows in CSS3 are divided into 2 categories: 1. Text shadow, setting syntax "text-shadow: horizontal position vertical position blur distance color;"; 2. Box shadow, setting syntax "box-shadow: horizontal position Vertical position blur distance spread color inset;".

There are several categories of shadows in css3

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

There are two types of shadows in CSS3: text-shadow and box-shadow. These two properties can achieve the shadow effect without adding a background image. They are provided when we beautify the web page. A great convenience. So how to use these two attributes respectively?

1. text-shadow

The syntax specification of this attribute is text-shadow: 1px 1px 1px #666 ;

Before talking about css shadow properties, let’s first understand the common sense about shadows.

Shadows are generated when light shines on an object, which will produce shadows in backlit areas.

The picture below is the shadow produced by right and downward:

There are several categories of shadows in css3

The picture below is the shadow produced by upward and left

There are several categories of shadows in css3

Let’s look at the text-shadow attribute. The attribute includes four values. The first value is the horizontal offset of the shadow, the second value represents the vertical offset, and the third value represents the shadow. Divergence range, the fourth value represents the shadow color.

First, by default, positive values are used for shadows to the right and downwards, and negative values are used for left and upward shadows.

text-shadow: 1px 1px 1px #666; means a shadow shifted one pixel to the right and downwards, text-shadow: -1px -1px 1px #666; means a shadow shifted to the left and upward Shifting shadow. text-shadow: 0px 0px 1px #666; means no offset. At this time, there will be equal shadows all around, as shown below

There are several categories of shadows in css3

## 2. Multiple sets of attribute values You can use commas to separate

text-shadow: 1px 1px 1px #666, -1px -1px 1px #666; means there is a shadow offset by one pixel all around.

Using the text-shadow attribute we can create exquisite embossed text effects.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            background-color: #cccccc;
        }
        p{
            text-align: center;
            font-size: 60px;
            margin-top: 50px;
            font-weight: bold;
            color: #cccccc;
        }
        .tu{
            text-shadow: -1px -1px 1px #fff,1px 1px 1px #000;
        }
        .ao{
            text-shadow: 1px 1px 1px #fff,-1px -1px 1px #000;
        }
    </style>
</head>
<body>
        <p>好好学习</p>
        <p>天天向上</p>
</body>
</html>

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There are several categories of shadows in css3

##2. box-shadowThe properties of box-shadow and text shadow are very similar. One is to add shadow to text, and the other is to add shadow to container.

The six values of box-shadow are as follows:

Note: You can add a shadow to the box or multiple shades. This attribute is a comma-separated list of shadows. Each shadow is specified by (2~4) length values, an optional color value, and the optional inset keyword. The value for omitted length is 0.

Example: Add multiple shadow styles

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>css3边框阴影</title>
    <style>
    #box1{ 
                margin-top: 100px;
        margin-left:100px; 
        background-color: #fff;
        width: 100px;
        height: 100px;
             box-shadow:
        2px 2px 10px red,
        5px 5px 20px blue;
        }
        </style>
</head>
 <body>
    <div id="box1"></div>
</body>
</html>

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