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diff --git a/src/sass/bootstrap4/mixins/_screen-reader.scss b/src/sass/bootstrap4/mixins/_screen-reader.scss
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+++ b/src/sass/bootstrap4/mixins/_screen-reader.scss
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+// Only display content to screen readers
+//
+// See: http://a11yproject.com/posts/how-to-hide-content/
+
+@mixin sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0,0,0,0);
+  border: 0;
+}
+
+// Use in conjunction with .sr-only to only display content when it's focused.
+//
+// Useful for "Skip to main content" links; see http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
+//
+// Credit: HTML5 Boilerplate
+
+@mixin sr-only-focusable {
+  &:active,
+  &:focus {
+    position: static;
+    width: auto;
+    height: auto;
+    margin: 0;
+    overflow: visible;
+    clip: auto;
+  }
+}