match block-header to style

I'm trying to add a widget for advertisements title. (this is me secret method to use sidebar for ads...)

but I got stuck, cuz it's not matching the site's block-header.

that's the code used in template:
CSS:

<div class="block">
    <div class="block-container">
        <h3 class="block-header">
            Advertisements
        </h3>
        <div class="block-body">
            <p style="font-size: 0.9em; text-align: center; margin: 0;">
                To advertise, please email: <a...

Read more

Читать далее...