Just a typo here. Replace : with ;

// Put this in your browser console
console.log('%cHello', 'color: green; background: yellow: font-size: 30px');
Colorful Console Message
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Samantha Ming
Akhil Gautam
·Follow
1 min read·
Dec 22, 2018
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Just a typo here. Replace : with ;
--
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Written by Akhil Gautam33 Followers
·35 Following
I am a fullStack developer building things at BigBinary using Ruby on Rails and React.js .
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