Custom html position-1 is displayed to big

I have the problem that on my joomla 3.x site for the custom html on postition -1 where on demo site "Incredible Features of JA Brisk" is shown I want to show the text "Welcher Kredit". But on my site the position is shown way to big, pls see attachment. What could be the cause?
Attachment 29351

I have used custom html module and added this code:

<h3 class="sl-title">Welcher Kredit passt zu mir?</h3> assigned it to position-1 and I did nothing else.

Pls help me.