add default box shadow reset

Author: RobinMalfait

src/index.js

@@ -40,6 +40,7 @@ const forms = plugin.withOptions(function (options = { strategy: 'base' }) {
           'padding-left': spacing[3],
           'font-size': baseFontSize,
           'line-height': baseLineHeight,
+          '--tw-shadow': '0 0 #0000',
           '&:focus': {
             outline: outline.none[0],
             'outline-offset': outline.none[1],