How to change background image by css

Hi, there.

I use twenty-twenty-three theme and I know how to add ID.

As my website show, there are three blue blocks and I hope I can place 3 different image as background.

But when I add the ID, and try to write the css, I can change first one block only? Why? Did I miss anything?

My Css code like under:

＃importantNotice{background-image:url(‘https://new.chhsban.edu.my/wp-content/uploads/2023/03/dragon_background4.png’);background-size:70%;background-repeat:no-repeat;background-position:right top};

＃HParent{background-image:url(‘https://new.chhsban.edu.my/wp-content/uploads/2023/03/dragon_background4.png’);background-size:70%;background-repeat:no-repeat;background-position:right top};

＃fenghua{background-url:(‘https://new.chhsban.edu.my/wp-content/uploads/2023/03/logo＿transparentback2.png’);background-repeat:no-repeat;background-position:right top};

thanks a lot.

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