MC-16289: Buttons for Credentials don't show correctly for PayPal

Author: OlgaVasyltsun

app/design/adminhtml/Magento/backend/Magento_Paypal/web/css/source/_module.less

@@ -0,0 +1,11 @@
+// /**
+//  * Copyright © Magento, Inc. All rights reserved.
+//  * See COPYING.txt for license details.
+//  */
+
+a {
+ &[data-paypal-button=true] {
+     display: inline-block;
+     margin: .6rem 0;
+ }
+}