--- /dev/null
+// stacking icons
+// -------------------------
+
+.#{$fa-css-prefix}-stack {
+ display: inline-block;
+ height: 2em;
+ line-height: 2em;
+ position: relative;
+ vertical-align: $fa-stack-vertical-align;
+ width: $fa-stack-width;
+}
+
+.#{$fa-css-prefix}-stack-1x,
+.#{$fa-css-prefix}-stack-2x {
+ left: 0;
+ position: absolute;
+ text-align: center;
+ width: 100%;
+ z-index: var(--#{$fa-css-prefix}-stack-z-index, #{$fa-stack-z-index});
+}
+
+.#{$fa-css-prefix}-stack-1x {
+ line-height: inherit;
+}
+
+.#{$fa-css-prefix}-stack-2x {
+ font-size: 2em;
+}
+
+.#{$fa-css-prefix}-inverse {
+ color: var(--#{$fa-css-prefix}-inverse, #{$fa-inverse});
+}