is there any way to create my own border style

Question

for example double border with different colours

Answer 1

elaborate?
example of what kind of styling?

Answer 2

https://www.w3schools.com/css/css_border.asp
some border styling option in css

Answer 3

using outline
.borders {
border: 5px solid blue;
outline: 5px solid red;
}

or you can user :before and :after
hope that helps :)

Answer 4

for example like double border with different colours