Use correct syntax.
1 files changed, 2 insertions(+), 2 deletions(-) M index.php
M index.php +2 -2
@@ 164,10 164,10 @@ display: block; text-decoration: underline; } - th span.desc:after { + th span.desc::after { content: " ▼"; } - th span.asc:after { + th span.asc::after { content: " ▲"; }