Spelling
Spelling is important. Be sure to spell check your work, because your spelling and grammar does have an impact on the impression that you make with your visitors.


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Proximity
Place items that relate to each other close to one another.


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Alignment
Keep a consistent alignment. Left alignment is much stronger than center alignment. Center alignment is very informal. 


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Repetition
Repeat background colors, font styles, font colors, buttons, layout style, etc. to give your website continuity.


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Contrast
Use good contrast with your web pages. Use dark text with very light backgrounds.


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