Add A class name

Questions
1

Hi

How do I add A class name to new shape on the page so I can change its CSS thru the HTML element?

I want to control the shape with the class name “test” - where do I insert the class name to that shape?

<style type="text/css">
.test {
 background-color: yellow ;
border-radius: 10px ;
}
</style>

TIA

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