How to change the color of usemap hot area in html code_html/css_WEB-ITnose

As the title says, divide a hotspot area on the picture and how to set the color of this area

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Directly upload png pictures

Or make the hotspot area display status into one picture
Switch between 2 pictures

There are many hotspot areas on the picture, and There are more than two states in each region

Like the changes in the selected power blocks on the continent
That is spelled out with pictures