hugo-theme-introduction/assets/vendor/fontawesome-free/scss/_rotated-flipped.scss

// rotating + flipping icons
// -------------------------

.#{$fa-css-prefix}-rotate-90 {
  transform: rotate(90deg);
}

.#{$fa-css-prefix}-rotate-180 {
  transform: rotate(180deg);
}

.#{$fa-css-prefix}-rotate-270 {
  transform: rotate(270deg);
}

.#{$fa-css-prefix}-flip-horizontal {
  transform: scale(-1, 1);
}

.#{$fa-css-prefix}-flip-vertical {
  transform: scale(1, -1);
}

.#{$fa-css-prefix}-flip-both,
.#{$fa-css-prefix}-flip-horizontal.#{$fa-css-prefix}-flip-vertical { 
  transform: scale(-1, -1);
}

.#{$fa-css-prefix}-rotate-by {
  transform: rotate(var(--#{$fa-css-prefix}-rotate-angle, none));
}