D2:double-border

code:Double-Border.d2

direction: right

x -> y: hi

x.style.double-border: true

y.shape: circle

y.style.double-border: true

https://d2.lucas.tools/?script=dMrBCcAgDAXQu1NkAR0gh-5SNdSA1PKNYLYv9N7jg1cVUkzHzQS9moVN8SBnahp2muZdUh0rd4l5oAqYDEuCp9nOR5iKovTPv_cNAAD__w%3D%3D&#.svg