List the basic Unit of CSS?

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The basic unit of CSS is a definition of a style property for a selected HTML tag written in the following syntax:
html_tag_name {style_property_name: style_property_value}

For example:
/* set background color to black for the <BODY> tag */
BODY {background-color: black}

/* set font size to 16pt for the <H1> tag */
H1 {font-size: 16pt}

/* set left margin to 0.5 inch for the <BLOCKQUOTE> tag */
BLOCKQUOTE {margin-left: 0.5in}
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