In CSS, you can use the `::first-letter` pseudo-element to target and style the first letter of an element. By setting the `text-transform` property of `::first-letter` to `capitalize`, you can achieve capitalizing the first letter.

Here's a concrete example:

```css
p::first-letter {
    text-transform: capitalize;
    font-size: 24px;
    font-weight: bold;
}
```

In this example, we target the first letter of a paragraph element (`<p>`) and capitalize it. Additionally, we increase the font size and font weight to make the first letter more prominent.

The HTML code is as follows:

```html
<p>这是一个段落，第一个字符将被大写并加粗显示。</p>
```

After rendering in the browser, the first Chinese character '这' will not be converted to uppercase (as Chinese characters have no case distinction), but if it were an English letter, it would be capitalized, and the font will be larger and bolder.

Note that `text-transform: capitalize;` does not alter the form of Chinese characters, as they lack case distinctions, but it is effective for English characters. To emphasize Chinese characters, you may need to use other CSS properties, such as adjusting font size or color.

Make the first character Uppercase in CSS

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