How to turn a square into a circle in css

How to turn a square into a circle in css: first create a new html sample file; then enter the div tag in the body tag, and add a class name to the div tag; finally, add the attribute "border- radius:150px" to turn the square into a circle.

The operating environment of this tutorial: Dell G3 computer, Windows7 system, PhpStorm 2019.3.1 x64&&HTML5&&css3 version.

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Create a new convert square into circle.html file, as shown in the picture:

Enter the HTML5 structure code and modify the content in the title tag to: change the square into a circle, as shown in the picture:

In Enter the div tag in the body tag, and add a class name (box) to the div tag, as shown in the figure:

Add CSS attributes to the class name (box), let It becomes a square, as shown in the picture:

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