Posted by TheMagician on Oct 10, 2019; 8:50am
URL: https://discuss.asciidoctor.org/Tip-Admonition-Icon-has-Yellowish-Shadow-SOLVED-tp7201p7210.html

Thank you very much. Changing the text-shadow property works!

For others looking to unify the shadow color of the admonition icons: The grey value of the shadow used in the default CSS is rgba(0,0,0,.5).