--- /dev/null
+// Shared between modals and offcanvases
+@mixin overlay-backdrop($zindex, $backdrop-bg, $backdrop-opacity) {
+ position: fixed;
+ top: 0;
+ left: 0;
+ z-index: $zindex;
+ width: 100vw;
+ height: 100vh;
+ background-color: $backdrop-bg;
+
+ // Fade for backdrop
+ &.fade { opacity: 0; }
+ &.show { opacity: $backdrop-opacity; }
+}