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resources/assets/vendor/scss/_bootstrap-extended/_offcanvas.scss

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+// Offcanvas
+// *******************************************************************************
+
+.offcanvas {
+  box-shadow: $offcanvas-box-shadow;
+  .offcanvas-header {
+    .btn-close {
+      padding: 0.44rem;
+      margin-right: 0;
+      background-size: 1.5rem;
+      background-image: str-replace(
+        str-replace($btn-close-bg, '#{$offcanvas-btn-close-color}', $headings-color),
+        '#',
+        '%23'
+      );
+    }
+  }
+}
+
+// RTL
+// *******************************************************************************
+@include rtl-only {
+  .offcanvas-start {
+    right: 0;
+    transform: translateX(100%);
+  }
+
+  .offcanvas-end {
+    right: auto;
+    left: 0;
+    transform: translateX(-100%);
+  }
+}