Support Safari by offering fallback default border-radius instead of nothing

[emilevictorportenart]

Instead of displaying nothing on safari, why not make sure that the border-radius is a default one and a border is added to the element?

Example

https://codepen.io/PavelLaptev/pen/OJWgReV

Chrome

Safari

[stepanjakl]

+1

[liamtucker]

+1