diff --git a/resources/assets/stylesheets/highcontrast.scss b/resources/assets/stylesheets/highcontrast.scss
index e3ae6dcc1601ec386a6aab81f8f6e4b1ee4a870a..0dda1fd2cb58e99af76b142cdae31faeb850583a 100644
--- a/resources/assets/stylesheets/highcontrast.scss
+++ b/resources/assets/stylesheets/highcontrast.scss
@@ -333,6 +333,10 @@ table.default {
 
 }
 
+article.wiki {
+    border: unset;
+}
+
 // remove this border, else you end up having two
 .studip-widget > div > article.studip {
     border: none !important;
@@ -380,6 +384,15 @@ article.new.toggle > header h1 > a::before {
     filter: unset !important;
 }
 
+// avoid having double outline and weird line at bottom
+form.default table.default {
+    border: unset;
+
+    tbody:last-of-type>tr:last-child>td {
+        border-bottom: unset;
+    }
+}
+
 /* Sections,Articles and Forms footer */
 form.default footer,
 table.default > tfoot > tr > td {