Change title on bold

Hi Tom!!

I’ve tried to change the title on bold, but I couldn’t do it.

I found in this forum the next css code:

.wp-show-posts .wp-show-posts-entry-title {
font-weight: bold;
}

But it doesn’t work.

I would apreciate that you help me.

Regards,

Agustín

The page I need help with: [log in to see the link]