blog-ruoyi/blog-web-static/lib/fontawesome-free/scss/_stacked.scss

// stacking icons
// -------------------------
@use 'variables' as v;

.#{v.$css-prefix}-stack {
  display: inline-block;
  height: 2em;
  line-height: 2em;
  position: relative;
  vertical-align: v.$stack-vertical-align;
  width: v.$stack-width;
}

.#{v.$css-prefix}-stack-1x,
.#{v.$css-prefix}-stack-2x {
  left: 0;
  position: absolute;
  text-align: center;
  width: 100%;
  z-index: var(--#{v.$css-prefix}-stack-z-index, #{v.$stack-z-index});
}

.#{v.$css-prefix}-stack-1x {
  line-height: inherit;
}

.#{v.$css-prefix}-stack-2x {
  font-size: 2em;
}

.#{v.$css-prefix}-inverse {
  color: var(--#{v.$css-prefix}-inverse, #{v.$inverse});
}