AdminLTE/scss/dark/bootstrap/_offcanvas.scss

.offcanvas {
  color: $offcanvas-color-alt;
  background-color: $offcanvas-bg-color-alt;
  @include box-shadow($offcanvas-box-shadow-alt);
}

.offcanvas-start {
  border-right: $offcanvas-border-width solid $offcanvas-border-color-alt;
}

.offcanvas-end {
  border-left: $offcanvas-border-width solid $offcanvas-border-color-alt;
}

.offcanvas-top {
  border-bottom: $offcanvas-border-width solid $offcanvas-border-color-alt;
}

.offcanvas-bottom {
  border-top: $offcanvas-border-width solid $offcanvas-border-color-alt;
}