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RGB
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#40E0D0 CSS / HTML Preview

Text with hexadecimal color #40E0D0

This text has a font color of #40E0D0. 

<span style="color:#40E0D0;">Your text here</span>
#40E0D0 border color

This element has a border color of #40E0D0. 

<div style="border:2px solid #40E0D0;">Content here</div>
#40E0D0 background color

This paragraph has a background color of #40E0D0. 

<p style="background-color:#40E0D0;">Content here</p>
CSS codes 
.text {color:#40E0D0;}
.background {background-color:#40E0D0;}
.border {border:1px solid #40E0D0;}