The CSS box-shadow property is used to add a shadow effect to an element. It allows you to control the shadow's color, blur, offset, and spread. Here is an example of how to use the box-shadow property in CSS:

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.element {
  box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
}

In the example above, the .element class will have a box shadow that is 2 pixels to the right, 2 pixels down, with a blur radius of 5 pixels, and a color with 50% opacity. You can modify the values to achieve different shadow effects.

Yes, you can apply CSS filters to elements other than images. The CSS filter property applies visual effects (like blur and saturation) to an element’s content. This can be an image, text, or any other content. Here is an example of a CSS filter applied to a paragraph element:

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p {
  filter: blur(4px);
}

This will apply a blur effect of 4 pixels to the entire content within the p element. You can learn more about CSS filters here.

To change the size of an image, you can use HTML and CSS. You can specify the dimensions of an image using the width and height attributes in HTML. For example, to set the width of an image to 500 pixels and height to 300 pixels, you can use the following:

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<img src="path/to/image.jpg" alt="image description" width="500" height="300">

You can also use CSS to set the dimensions of an image by targeting the img tag and setting the width and height properties. For example, to set the width of an image to 500 pixels and height to 300 pixels using CSS, you can use the following:

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img {
  width: 500px;
  height: 300px;
}

Keep in mind that changing the image size may affect the quality of the image. It's usually best to use the original image size or a higher quality version to avoid pixelation or blurriness.

To add shadow to a button you can use the CSS box-shadow property. You can set values for the box-shadow such as x-offset, y-offset, blur-radius, spread-radius, and color. Here's an example using a <button> element.

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button {
  box-shadow: 2px 2px 4px 2px rgba(0, 0, 0, 0.3);
}

This will add a shadow to the button with a horizontal offset of 2px, a vertical offset of 2px, a blur radius of 4px, a spread radius of 2px, and a color of rgba(0, 0, 0, 0.3) which is a slightly transparent black color. You can adjust the values to fit your desired style. Here's a link with more information about the box-shadow property: MDN Web Docs - box-shadow.

A glassy background can be achieved using CSS3's backdrop-filter property. The blur() function can be used to make the background appear glassy.

Example:

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body {
   backdrop-filter: blur(8px); 
}

To create a shadow under a button in CSS, you need to use the property box-shadow. The syntax is:

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box-shadow: h-shadow v-shadow blur spread color inset;

Where:

• h-shadow is the position of the horizontal shadow
• v-shadow is the position of the vertical shadow
• blur is the blur of the shadow
• spread is the size of the shadow
• color is the color of the shadow
• inset specifies whether the shadow should be inside (inset) or outside (outset)

For example, here is a code for a button with a drop shadow:

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.button {
  box-shadow: 2px 2px 2px 0px rgba(0,0,0,0.5);
}

You can find more examples and details on the MDN web docs page for box-shadow.

The box-shadow property in CSS allows you to add a shadow to an element. It takes a comma-separated list of values, with the syntax being:

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

A few examples of box-shadow usage:

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box-shadow: 10px 10px 5px #888; 
/* Offset of 10px 10px, blur of 5px and a gray (#888) color */

box-shadow: 5px 5px 0px 0px rgba(0,0,0,0.75);
/* Offset of 5px 5px, no blur and a black color with an opacity of 75% */

box-shadow: inset 0 0 10px #000;
/* An inner shadow, with an offset of 0 0, a blur of 10px and a black color */

For more details, see the MDN documentation about box-shadow.

The box-shadow CSS property adds shadows around an element's frame. You can apply multiple shadows to an element by giving a comma-separated list of shadows. To use box-shadow, you specify values for color, x-offset, y-offset, blur, and spread radius.

Syntax:

box-shadow: none | [ , ]*

Examples:

CSS:

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.shadow {
  box-shadow:  0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
}

HTML:

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<div class="shadow">Box Shadow Example</div>

More information can be found at MDN web docs.

The backdrop-filter CSS property lets you apply graphical effects such as blurring or color shifting to the area behind an element. These effects can then be combined with clipping and typographic techniques to create a wide range of creative effects.

To use backdrop-filter, you’ll need to include the prefixes for different browsers. The code should look something like this:

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-webkit-backdrop-filter: blur(5px);
        backdrop-filter: blur(5px);

For more information and examples, you can refer to the MDN Documentation.