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#1 How to make all the flex items in a single row equal in width?

#2 flex-5
#3 flex-flow is a shorthand for
#4 flex: 1 0 50%; is equivalent to
flex-basis: 0;
flex-grow: 50%;
flex-grow: 0;
flex-basis:50%;
flex-shrink: 0;
flex-grow: 50%;
flex-shrink: 0;
flex-basis: 50%;
#5 How to correctly place a grid item inside a named area?

#6 css-grid-4
#7 The order property apply to both flex items and grid items
#8 Which property cannot be used with negative values?
#9 How to place a grid item across 2 columns?
#10 What is the default value of the flex-shrink property?

#11 css-grid-5
#12 How to define 3 columns in CSS grid?
#13 The justify-self property apply to both flex items and grid items
#14 grid-area: 1/4; is equivalent to
grid-column-end: 4;
grid-column-start: 4;
grid-row-end: 4;

#15 css-grid-6
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