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css - How to apply box-shadow on all four sides? - Stack Overflow
GitHub - bbutler522/Email-Box-Shadow-Alternative: A straightforward and seemingly cross-browser solution to add a psuedo box-shadow to HTML Emails
CSS3 in practice, maddesigns (Sven Wolfermann) #css3
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border-radius and box-shadow support across browsers | The Electric Toolbox Blog
the new code – Creating a True Cross-Browser Drop Shadow Effect With CSS & SVG
A Close Look at CSS Box Shadow - WebFX
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How to Create Drop Shadows with the box-shadow Property in CSS3 | Webucator
CSS Box-shadow: There Is Something in the Shadow | HackerNoon
CSS Box Shadow | CSS-Tricks - CSS-Tricks
CSS3 Box Shadow | FormGet
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google chrome - CSS mobile: box-shadow doesn't work correctly - Stack Overflow
12+ CSS Box Shadow Examples - csshint - A designer hub
Free Design Resources: CSS Buttons - 34SP.com Blog
Dev.Opera — Cross-Browser CSS box-shadows
Box Shadow Generator Collection - TemplatePocket
