bootstrap4 suport, chenge style

src/client/js/components/Admin/Security/GitHubSecuritySetting.jsx

@@ -69,7 +69,7 @@ class GitHubSecurityManagement extends React.Component {
         )}
 
         <div className="row mb-5">
-          <div className="offset-3 col-6 text-left">
+          <div className="col-12 offset-md-3 col-md-6">
             <div className="custom-control custom-switch custom-checkbox-success">
               <input
                 id="isGitHubEnabled"
@@ -88,8 +88,8 @@ class GitHubSecurityManagement extends React.Component {
         </div>
 
         <div className="row mb-5">
-          <label className="col-3 text-right py-2">{t('security_setting.callback_URL')}</label>
-          <div className="col-6">
+          <label className="col-12 col-md-3 text-left text-md-right py-2">{t('security_setting.callback_URL')}</label>
+          <div className="col-12 col-md-6">
             <input
               className="form-control"
               type="text"