QR code component

This was a great easy design to get back into doing something with HTML and CSS as I've been just focusing on JS for the past month or so. It was a very easy design so it didn't take me long at all to complete however I feel like I didn't the the box-shadow effect quite right so I'm interested in learning how you guys got it done cause on my display it didn't seem like it quite matched the design, maybe it's always going to be different depending on the display of the user. Any feedback that you can provide is greatly appreciated, especially on the box-shadow effect of the card.