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#1 Which of the following is an invalid property?
#2 Which property cannot be used with negative values?

#3 css-grid-2

#4 css-grid-6
#5 Which of the following is an invalid property?
#6 How to correctly place a grid item inside a named area?

#7 css-grid-5

#8 css-grid-4
#9 How to make all the flex items in a single row equal in width?
#10 flex: 1 0 50%; is equivalent to
flex-shrink: 0;
flex-grow: 50%;
flex-shrink: 0;
flex-basis: 50%;
flex-basis: 0;
flex-grow: 50%;
flex-grow: 0;
flex-basis:50%;

#11 css-grid-3
#12 How to place a grid item across 2 columns?
#13 How to define 3 columns in CSS grid?

#14 css-grid-1

#15 flex-2
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