Changing header height using CSS not working

Hi, 

I'm trying to reduce the header height to 50% of what it currently is. We are using the classic header, and 'minimalist without header space'. 

I have added the following to custom CSS section: 

.header-classic #Top_bar{
height: 50%;
}

But it's not working - please can you help? I'm sure I am not using the correct CSS - if you can help me to figure out what the correct code is, I would appreciate it. 

Thank you, 

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