How to make Responsive Equal height Column Using HTML CSS and FlexBox

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Github: https://github.com/internetpirate11/Responsive-Equal-height-Column-using-Flexbox
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Music in this video: Happy Life - Fredji
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#equal-height-columns
#css-tutorials
#css-equal-heights
#flexbox-equal-heights
#css-FLEXBOX
#css-Responsive-flexbox-layout
#css-flexbox-layouts