admin/view/stylesheet/sass/bootstrap/mixins/_border-radius.scss

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// Single side border-radius

@mixin border-top-radius($radius) {
  border-top-right-radius: $radius;
   border-top-left-radius: $radius;
}
@mixin border-right-radius($radius) {
  border-bottom-right-radius: $radius;
     border-top-right-radius: $radius;
}
@mixin border-bottom-radius($radius) {
  border-bottom-right-radius: $radius;
   border-bottom-left-radius: $radius;
}
@mixin border-left-radius($radius) {
  border-bottom-left-radius: $radius;
     border-top-left-radius: $radius;
}