html - Box-shadow inset & border:none cause form fields to flicker in IE/Edge - Stack Overflow
Box Shadow SCSS Mixin - Codepad
Germa Vinsmoke on Twitter: "By default, box-shadow acts as a drop-shadow, i.e, looks like the box was raised. But we can provide the opposite effect also with the help of "inset" keyword.
Css
how to add a drop shadow effect on a vb net winform with its form border style property set to none - BILLYSOFTACADEMY