Struggling with these questions and hope to get some clarity on what I`m doing wrong.

Question 2 Program a CSS media query that is triggered if the screen is at least 900px wide, but use em as the size unit in the query. Within the media query, write a rule for an element with a id equal to header. That rule should set the font size to three times the current size. Note: You should assume the parent element's font-size is equivalent to 16px. @media screen and (min-width: 56.25em) { .header { font-size:300%; } } Question 5 Program a CSS media query that is triggered on all media types if the media is at least 400px wide, but use em as the size unit in the query. Note: The media query does not need any rules inside it's brackets. You should assume the parent element's font-size is equivalent to 14px. @media (min-width:28.571em) {} Feedback Question 6 Program a CSS media query that is triggered if the screen is at least 400px wide, but use em as the size unit in the query. Note: The media query does not need any rules inside it's brackets. You should assume the parent element's font-size is equivalent to 24px. @media screen and (min-width: 16.667em) {} Feedback Question 9 Program a CSS ruleset that will set the root font size for the HTML document to match the user's browser preference. Feedback