To insert an image as the background in CSS, you can use the background-image property. Here's an example of how to do it:

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body {
  background-image: url("image.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}

In the example above, image.jpg should be replaced with the actual path or URL of the image you want to use.

The background-image property sets the image to be used as the background, while background-repeat: no-repeat ensures that the image is not repeated. background-size: cover makes the image cover the entire background area, and background-position: center centers the image within the background.

You can adjust these properties according to your specific requirements.

To change the height and width of a background image in the body tag, you can use the background-size CSS property. Here is an example in CSS:

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body {
  background-image: url("your_image.jpg");
  background-size: 50% 50%; /* the first value is the width, the second value is the height */
}

In this example, background-size sets the background image to take up 50% of the width and 50% of the height of the body element. You can adjust these values to make the image larger or smaller as needed.

You can also use specific values for width and height (in pixels or other units) or use cover or contain as values to make the image fill the entire element or fit inside it.

Here is some more info on the background-size property: MDN web docs

To stop the background image from repeating, you can use the background-repeat CSS property and set its value to no-repeat. This will ensure that the background image appears only once and covers the entire screen. You can also use the background-size CSS property to make the image the size of the screen. Here's an example:

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body {
  background-image: url("your-image-url.jpg");
  background-repeat: no-repeat;
  background-size: cover;
}

In this example, the background image will not repeat and will cover the entire screen. You can replace "your-image-url.jpg" with the URL or file path to your own background image. This code can be used with HTML and CSS.

To make an icon smaller in CSS, you can use the font-size property. If the icon is an inline element, you can simply reduce the font size until the desired size is achieved:

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.icon {
  font-size: 0.8em;
}

If the icon is a background image, you can adjust the sizing of the background using background-size:

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.icon {
  background-size: 50%;
}

Here, the background-size property is set to 50%, which will shrink the size of the background image to half its original size.

If you're using an SVG image as an icon, you can directly change the width and height of the SVG element itself:

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svg.icon {
  width: 32px;
  height: 32px;
}

In this example, the width and height of the SVG are set to 32 pixels, which will resize the icon to the desired size.

You can create a full-page background image using CSS using the background and background-size properties like this:

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body { 
  background-image: url('background_image.jpg');
  background-size: cover;
}

This will stretch and scale the background image to fit the whole page. For more detailed instructions, check out this article.

You can use the background-image CSS property to add a background image from a local file to an element (in this case the body):

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body { 
  background-image: url('./my-background-image.jpg');
}

You will also need to set the background-size, background-repeat, background-attachment, background-position and background-origin properties appropriately based on the style you wish to achieve.

For more information, please see MDN Documentation on the background-image CSS property.

To fix a background image, you can use the CSS background-image property. To set the background of an element, use a basic syntax combining the background-image property and the url() function. See the example below:

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element {
    background-image: url("image.jpg");
}

You can also set the size, position, and tiling option of the background image with the background-size, background-position, and background-repeat properties. See the example below:

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element {
    background-image: url("image.jpg");
    background-size: cover; // makes background image full-coverage
    background-position: center;
    background-repeat: no-repeat; // removes any tiling that would otherwise occur
}

For more information about the CSS background-image property and how to use it, you can refer to MDN's documentation.