So I eventually solved it guys! I do not like unresponsive pages and it's quite easy.
Login to your nabble site and click on the edit this page link in the footer, look for the login_form macro (could take sometime)
Or find it directly using this link
https://
yourdomainname.com/template/NamlServlet.jtp?macro=macro_viewer&id=login_form%21custom_tweak%3Alogin_form&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.ServletNamespace&breadcrumbs=macro_viewer%21nabble%3Amacro_viewer.naml-source_panel%21nabble%3Amacro_viewer.naml-editor_left_controls%21nabble%3Amacro_viewer.naml
Replace yourdomainname text with your site url
Click on override. Find this code on line 69
What you do next is to edit it, remove size="48" then click save/override
Done! Should work perfectly now!