adjust saml setting form

src/server/views/admin/widget/passport/saml.html

@@ -148,7 +148,7 @@
     <div class="form-group">
       <label for="settingForm[security:passport-saml:cert]" class="col-xs-3 control-label">Certificate</label>
       <div class="col-xs-6">
-        <textarea class="form-control" type="text" rows="5" name="settingForm[security:passport-saml:cert]">{{ settingForm['security:passport-saml:cert'] || '' }}</textarea>
+        <textarea class="form-control input-sm" type="text" rows="5" name="settingForm[security:passport-saml:cert]">{{ settingForm['security:passport-saml:cert'] || '' }}</textarea>
         <p class="help-block">
           <small>
             {{ t("security_setting.SAML.cert_detail1") }}<br>