Custom Block customization

OJS 3.1.14
Theme: manuscript child theme
I want my custom block (Editorial Policies) to appear in the default block style like Information block as you can see in the screenshot.

I believe all the custom blocks should appear by default in the generic theme style. But in my case, it is appearing differently. Please help me to fix this.

Done, problem solved.

Please explain how to solve the problem, to help other people at the same problem as yours.

I set the margin to zero with the following code
<div style="margin: 0px 0px 0px 0px;"><span class="title">EDITORIAL POLICIES</span>