[mod] simple theme: define a '.show-content-button'

With LESS function '.show-content-button' all the *Show-Media* links becomes
bottons.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/static/themes/simple/src/less/style.less

@@ -190,8 +190,7 @@ article[data-vim-selected].category-social {
   }
 
   .content,
-  .stat,
-  .altlink {
+  .stat {
     font-size: 0.9em;
     margin: 0;
     padding: 0;
@@ -206,6 +205,12 @@ article[data-vim-selected].category-social {
     }
   }
 
+  .altlink a {
+    font-size: 0.9em;
+    margin: 0 10px 0 0;
+    .show-content-button;
+  }
+
   .codelines {
     .highlight {
       color: inherit;