Using "style" Attribute can use like CSS.
Font Size 32px & Color Red.
Default font-size of modan browser is set 16px.Color is black.
If you can change text design easily, use "style" Attribute.
Which format we should choose?
We can choose it as you like.
Useing this text(cop & past your index.hmtl), try to design text.
Font Size 32px and color is RED.
Font Size 10px and color is BLACK.
Font Size 48px and color is BULE.
Font Size 16px and color is WHITE.