Jiarong-Cao-Sprint-Challenge-User-Interface retro, still working on tablet part.#1326

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jjiarongcao1 wants to merge 3 commits intobloominstituteoftechnology:masterfrom jjiarongcao1:Jiarong-Cao

+272-7

Commits on May 18, 2020

Sprint-Challenge-User-Interface retro, still working on tablet part.
jjiarongcao1
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Sprint Challege for user interface, finished tablet part, also modified some other css codes as well.
jjiarongcao1
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Commits on May 20, 2020

Self study questions added.
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