want an offset border around the button that

Hi! I am coding out the form on this page https://gopher-walrus-bjga.squarespace.com/contact-copy, to match the form on this page https://moversshakers.co/contact

I need an offset black border around the button here please see the button on the contact page to help.

I also want to add in the yellow stars as required fields, thanks!

My testing

I use this code for my buttons to give them a gray offset drop shadow. You can put it in a markdown block or advance page injection for the page you want it on. The color can be changed. #000000 is solid black. 

<style>
.button-block {
filter: drop-shadow(8px 8px
8px #666666);
}</style>

7 hours ago, Beyondspace said:

You can try adding to Home > Design > Custom Css

input[type=submit] {
  box-shadow: 5px 5px; 
}

Support me by pressing 👍  or marking as solution if this useful for you

thank you!!