diff --git a/libs/remix-ui/run-tab/src/lib/components/contractDropdownUI.tsx b/libs/remix-ui/run-tab/src/lib/components/contractDropdownUI.tsx
index 5a59befec9..87912eccc4 100644
--- a/libs/remix-ui/run-tab/src/lib/components/contractDropdownUI.tsx
+++ b/libs/remix-ui/run-tab/src/lib/components/contractDropdownUI.tsx
@@ -533,7 +533,7 @@ export function ContractDropdownUI(props: ContractDropdownProps) {
             >
               <input
                 ref={atAddressValue}
-                className={(!addressIsValid ? 'border border-danger' : 'border-0') + ' h-100 udapp_input udapp_ataddressinput ataddressinput form-control'}
+                className={(!addressIsValid ? 'border border-danger' : 'border-dark') + ' h-100 udapp_input udapp_ataddressinput ataddressinput form-control'}
                 placeholder={intl.formatMessage({
                   id: 'udapp.loadContractFromAddress',
                 })}