Using the ::before and ::after pseudo-elements

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::first-letter - applied to the first letter of an element to make it special. This is often used to style the initial letters of paragraphs, like in old books.

Highlighting the First Letter in a Paragraph with the ::first-letter Pseudo-Element
Highlighting the first letter in a paragraph using the ::first-letter pseudo-element. Source: author
::first-line — styles the first line of text in an element.

Styling the First Line with the ::first-line Pseudo-Element
Styling the first line with the ::first-line pseudo-element. Source: author
These pseudo-elements are widely supported by modern browsers, but to ensure compatibility it is recommended to check them on the Can I Use site .

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Layering One Element on Another with CSS
To layer one element on top of another, CSS uses three main methods:



The ::before pseudo-element adds a semi-transparent denmark telegram data background underneath the text. Source: Author
The z-index property is used to control the stacking order of elements. The higher the z-index value, the higher the element is in the stacking layer.

The z-index property creates an order between the heading, paragraph and text background.
The z-index property created an order between the heading, paragraph, and background of the text. Source: Author
You can also use floating and fixed elements position: fixed and position: absolute for overlay. They allow you to place elements independently of the document flow.

Create blocks that remain even when you scroll the page
Creating blocks that will remain even when you scroll the page. Source: author
Placeholder and what do pseudo-elements have to do with it
Placeholder in HTML is a placeholder text that is displayed inside a form element (such as a data entry field) until the user starts entering data. It is a text hint that helps the user understand what to enter in the field: "Enter your name", "Login/password", etc.