RSS Feed/News match block-header to style

[ENXF NET]

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

but 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...

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