diff --git a/src/admin/components/forms/field-types/Textarea/index.scss b/src/admin/components/forms/field-types/Textarea/index.scss
index 08eba77130..fbbc8c0821 100644
--- a/src/admin/components/forms/field-types/Textarea/index.scss
+++ b/src/admin/components/forms/field-types/Textarea/index.scss
@@ -6,13 +6,13 @@
 
   .textarea-outer {
     @include formInput();
-    display: block;
+    display: flex;
     resize: vertical;
-    height: auto;
     min-height: base(3);
+    height: 100%;
 
     // Scrollbar for giant content
-    max-height: 90vh;
+    max-height: calc(100vh - $top-header-offset - calc(#{base(5)}));
     overflow: auto;
 
     @include mid-break {