How do you add a background color for all elements?

Computer Applications

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We define a rule for <h1> tag and use the property background-color to set the background color for all h1 elements.

For example, to set the background color of all <H1> elements to blue, we define the rule as follows:

h1 { background-color : blue ; }

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How do you display a border like this :

The top border = 10 pixels 
The bottom border = 5 pixels 
The left border = 20 pixels 
The right border = 1pixel