move captcha style to a css class so that it is easily customisable

bt5/erp5_km/SkinTemplateItem/portal_skins/erp5_km_theme/km_css/km.css.xml

@@ -1290,6 +1290,11 @@ button.formbt > span{\n
 .blog-next-article:after {\n
   content:">"\n
 }\n
+\n
+.captchas_dot_net {\n
+    border: none; \n
+    vertical-align: bottom\n
+}\n
 </tal:block>
 
 ]]></unicode> </value>

bt5/erp5_km/bt/revision

-1884
+1885
\ No newline at end of file

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/erp5.css.xml

@@ -1432,6 +1432,11 @@ div.pdf-preview-navigation img.last{\n
 .horizontal_align_form_box >  div.input > fieldset > div.field > label {\n
     width: auto;\n
     padding-top: 2px;\n
+}\n
+\n
+.captchas_dot_net {\n
+    border: none; \n
+    vertical-align: bottom\n
 }
 
 ]]></string> </value>

product/ERP5/bootstrap/erp5_xhtml_style/bt/revision

-1115
+1116
\ No newline at end of file

product/ERP5Form/CaptchasDotNet.py

@@ -86,7 +86,7 @@ class CaptchasDotNet:
     def image (self, random, id = 'captchas.net'):
         return '''
         <a href="http://captchas.net"><img
-            style="border: none; vertical-align: bottom"
+            class="captchas_dot_net"
             id="%(id)s" src="%(source)s" width="%(width)d" height="%(height)d"
             alt="The CAPTCHA image" /></a>
         <script type="text/javascript">