diff --git a/src/core/components/combobox/combobox.scss b/src/core/components/combobox/combobox.scss
index 8ebd587a7..e270c8528 100644
--- a/src/core/components/combobox/combobox.scss
+++ b/src/core/components/combobox/combobox.scss
@@ -121,15 +121,7 @@ ion-button {
         text-overflow: ellipsis;
     }
     .sr-only {
-        position: absolute;
-        width: 1px;
-        height: 1px;
-        padding: 0;
-        margin: -1px;
-        overflow: hidden;
-        clip: rect(0, 0, 0, 0);
-        white-space: nowrap;
-        border: 0;
+        @include sr-only();
     }
 
     &.ion-activated {
diff --git a/src/theme/bootstrap.scss b/src/theme/bootstrap.scss
index 0be89e900..673073c71 100644
--- a/src/theme/bootstrap.scss
+++ b/src/theme/bootstrap.scss
@@ -1,14 +1,7 @@
 // Text for accessibility, hidden from the view.
 .sr-only, .accesshide {
-    position: absolute;
-    width: 1px;
-    height: 1px;
-    padding: 0;
-    margin: -1px;
-    overflow: hidden;
-    clip: rect(0, 0, 0, 0);
-    white-space: nowrap;
-    border: 0;
+    @include sr-only();
+
     display: block !important;
 }
 
diff --git a/src/theme/helpers/custom.mixins.scss b/src/theme/helpers/custom.mixins.scss
index 2fab25f57..dac3ec43c 100644
--- a/src/theme/helpers/custom.mixins.scss
+++ b/src/theme/helpers/custom.mixins.scss
@@ -95,6 +95,18 @@
     transition: $transitions;
 }
 
+@mixin sr-only() {
+    position: absolute;
+    width: 1px;
+    height: 1px;
+    padding: 0;
+    margin: -1px;
+    overflow: hidden;
+    clip: rect(0, 0, 0, 0);
+    white-space: nowrap;
+    border: 0;
+}
+
 /**
  * Same as item-push-svg-url but admits flip-rtl
  */
diff --git a/src/theme/theme.base.scss b/src/theme/theme.base.scss
index 1d3f41565..62e2bd598 100644
--- a/src/theme/theme.base.scss
+++ b/src/theme/theme.base.scss
@@ -436,6 +436,10 @@ div.core-iframe-network-error {
     background: url("/assets/fonts/font-awesome/solid/wifi.svg") no-repeat 50% 50%;
     margin: 25px auto;
 
+    h2 {
+        @include sr-only();
+    }
+
     &::after {
         content: " ";
         position: absolute;