https://unsplash.com/
https://cssreference.io/
https://css-tricks.com/almanac/properties/f/font/
https://www.w3schools.com/css/css_font.asp
https://fonts.google.com/
https://developers.google.com/fonts/docs/getting_started
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox
http://cssspecificity.com/
https://tympanus.net/codrops/
https://pagecrafter.com/responsive-background-image-sprites-css-tutorial/
https://www.quackit.com/html/codes/html_borders.cfm
https://webplatform.github.io/docs/
http://daveshea.com/projects/zen/
http://www.csszengarden.com/219/
https://www.w3.org/TR/CSS22/intro.html#design-principles
https://stylestage.dev/#contribute
https://www.w3.org/TR/css-color/#color-keywords
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