要有效使用CSS陰影，需掌握box-shadow和text-shadow的正確用法。1. box-shadow用于元素邊框陰影，語(yǔ)法包含水平偏移、垂直偏移、模糊半徑、擴(kuò)展半徑、顏色及inset參數(shù)，可設(shè)置多個(gè)陰影以增強(qiáng)立體感；2. text-shadow用于文本陰影，語(yǔ)法包括水平偏移、垂直偏移、模糊半徑和顏色，同樣支持多個(gè)陰影效果；3. 使用時(shí)應(yīng)保持陰影自然，選用rgba顏色并測(cè)試不同背景下的顯示效果，避免過(guò)度使用影響視覺(jué)層次。

Adding shadows to boxes and text is a great way to add depth and visual interest to your web design. In CSS, we have two properties specifically for this: box-shadow for elements like divs or buttons, and text-shadow for text elements.

Here’s how to use them effectively:

How to Use box-shadow

The box-shadow property lets you add shadow effects around an element’s frame. You can control the direction, blur, spread, color, and even apply multiple shadows.

Basic syntax:

box-shadow: [horizontal offset] [vertical offset] [blur radius] [spread radius] [color] [inset];

• Horizontal offset: How far to push the shadow left or right (positive = right, negative = left)
• Vertical offset: How far to push the shadow up or down (positive = down, negative = up)
• Blur radius: The larger the value, the more blurred the shadow becomes
• Spread radius: Expands or contracts the shadow size
• Color: Optional — defaults to black if not set
• Inset: Makes the shadow appear inside the box instead of outside

Example:

.card {
  box-shadow: 2px 4px 8px rgba(0, 0, 0, 0.2);
}

This creates a subtle drop shadow that gives the card a lifted appearance.

You can also apply multiple shadows by separating each with a comma:

box-shadow: 
  0 2px 4px rgba(0,0,0,0.1),
  4px 4px 8px rgba(255,0,0,0.3);

How to Use text-shadow

The text-shadow property adds shadows to text. It’s especially useful for making text stand out on complex backgrounds.

Basic syntax:

text-shadow: [horizontal offset] [vertical offset] [blur radius] [color];

• Horizontal and vertical offsets work similarly as in box-shadow
• Blur radius softens the edge of the shadow
• Color is optional — default is black

Example:

.title {
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

This adds a dark shadow slightly to the bottom-right of the text.

Like box-shadow, you can apply multiple text shadows:

text-shadow: 
  1px 1px 2px red,
  -1px -1px 2px blue;

Tips for Using Shadows Effectively

• Keep it subtle: Too much shadow can distract from content.
• Use rgba colors: This allows semi-transparent shadows which look more natural.
• Test on different backgrounds: Shadows may need tweaking depending on where they’re displayed.
• Avoid overuse: Don’t apply shadows to every single element — pick key items to highlight.

Also, remember that while shadows enhance visuals, they don’t affect layout — the space taken by the shadow doesn’t influence surrounding elements.

Shadows are simple but powerful tools in CSS. Whether it's box-shadow or text-shadow, knowing how to adjust their values gives you more control over your site’s visual hierarchy.

基本上就這些。

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