CSS not affecting header minimum height

Please forgive me, I am very new to this, have been trying to change a huge amount of white space in my single post page header using CSS. When viewing a single post such as:


If I right click on the white space above the post title and click "inspect element" I can see the #Header has a "minimum-height" of "250px". Changing this in the browser to 50px displays the post as I want it to look. 

If I then take the following CSS and paste it into custom CSS this, it does not affect the page. I have other CSS in the same place which does work. But this does not. 

#Header {
min-height: 50px;
}

Any help would be appreciated. 

Thanks. 

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