classとidの指定方法

classを指定しない場合は灰色表示

classで青色に変更（属性の上書き）

id指定でオレンジに変更

h1をblueクラスで修飾

pタグをp.blueクラスで修飾

pタグにblue text-center smallクラスを指定

classでgreenを指定

classのgreenとidのredを指定　idが優先される

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