Modal: Remove unused CSS variables

[louismaximepiton]

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[julien-deramond]

Maintenance question: isn't it "better" to keep the variables and set them to $btn-close-padding? It would be closer to Bootstrap.

.btn-close {
    margin: calc(#{$btn-close-padding} * -1) calc(#{$btn-close-padding} * -1) calc(#{$btn-close-padding} * -1) auto; // Boosted mod: using custom properties for padding
  }

[louismaximepiton]

That's a good question and I don't have the answer right now. Maybe it's better, I'll give it a try !

[julien-deramond]

Let's do it like this for the moment. It is consistent with other files: _accordion.scss, _list-group.scss and _navbar.scss.