It seems like you're referring to a specific formatting or styling of text, possibly in a digital context or document, where the text is displayed with a red background、This can be achieved in various ways depending on the platform, software, or markup language you're using、Here are some general methods to apply a red background to text:

In Microsoft Word

1、Highlighting Text:
Select the text you want to format.
Go to the Home tab.
In the Font group, click on the `Text Highlight` button (it looks like a pen).
Choose a red highlight color from the palette.

2、Using Shading:
Select the text.
Go to the Home tab.
In the Paragraph group, click on the `Shading` button (it looks like a paint bucket).
Select a red fill color.

In Google Docs

1、Highlighting Text:
Select the text.
Click on the `Highlight` button in the toolbar (it looks like a pen).
Select a red color.

2、Using Background Color in Drawing:
Select the text.
Go to `Insert` `Drawing`.
Select the text tool and highlight your text.
Use the fill color tool to select red.

In HTML

If you're working on a web page or using HTML for any reason:

html
<span style=backgroundcolor: red;Your text here</span

This will put a red background behind your text.

In Markdown or Markdownlike Formatting

Some platforms supporting markdown allow you to use HTML tags directly, or they might have their own syntax for highlighting text、For instance:

Using HTML (as above) directly in markdown.
Some platforms might support `==text==` for highlighting, but this is less common for background colors.

In LaTeX

If you're working with LaTeX:

latex
\documentclass{article}
\usepackage{xcolor}
\begin{document}
\textcolor{white}{This is a text with } \textcolor{red}{\textbf{red background}}.
\end{document}

Or more specifically for a box around text:

latex
\documentclass{article}
\usepackage{framed}
\begin{document}
\begin{framed}
Text with a default background, change as needed.
\end{framed}
Or using tcolorbox package:
\usepackage{tcolorbox}
\begin{tcolorbox}[fill=red!20]
Text here.
\end{tcolorbox}
\end{document}

Directly in Chat or Forum Posts

The method to change the background color of text in chat or forum posts varies widely between platforms、Usually, there's a formatting toolbar or you can use BB codes (like `[background=red]text[/background]`), depending on the platform's support.

General Advice

Software Specific: Always check the specific software or platform's help documentation for how to change text background colors, as methods can vary significantly.
HTML and CSS: For webrelated tasks, learning basic HTML and CSS can provide you with a wide range of text styling options.

If you have a specific application or context in mind, providing that detail can yield a more tailored solution.