diff --git a/app/assets/css/vendor-override.css b/app/assets/css/vendor-override.css
index 731b6fbd1..92f4bac6a 100644
--- a/app/assets/css/vendor-override.css
+++ b/app/assets/css/vendor-override.css
@@ -238,6 +238,12 @@ textarea {
   background: var(--text-input-textarea);
 }
 
+[theme='highcontrast'] input,
+[theme='highcontrast'] select,
+[theme='highcontrast'] textarea {
+  border: 1px solid var(--white-color);
+}
+
 .daterangepicker {
   background-color: var(--bg-daterangepicker-color);
   border: 1px solid var(--border-daterangepicker-color);
diff --git a/app/react/components/form-components/ReactSelect.css b/app/react/components/form-components/ReactSelect.css
index e0ea54b70..29b4b94b2 100644
--- a/app/react/components/form-components/ReactSelect.css
+++ b/app/react/components/form-components/ReactSelect.css
@@ -52,6 +52,8 @@
   border-color: var(--border-form-control-color);
   background-color: var(--bg-inputbox);
   box-shadow: none;
+
+  @apply th-highcontrast:border-white;
 }
 
 /* Match the same box shadow styles as the other portainer inputs, which are inherited from the bootstrap form-control class */