css flex split menu
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STEP1:
HTML
Three columns contain cover with title and logo image, and the content is the menu lists hidden first.
STEP2:
CSS
Google Fonts imported.
The container display flex.
Each screen ocupied same space with flex-grow:1.
The pink squre centered all the tag inside.
Different background color for screen and content.
When hovering, the screen expand to 5 times.
The content can not see at first.When hovering the button and the content, the content show up with animation.