paper-toolbar does not center content - css

I want to center the title and navigation links in my paper-toolbar. I am using the properties "justify" and "bottomJustify" to accomplish this, but the content remains on the left side.
<paper-toolbar class="medium-tall" justify="center" bottomJustify="center">
<div class="title">Titel</div>
<div class="bottom">
<a data-route="contact" href="contact">
<span>Contact</span>
</a>
</div>
</paper-toolbar>
It does not matter which "tallness" I choose. It never works. Does anyone has an idea how to solve this?
Update:
This code works:
<paper-toolbar class="medium-tall" justify="center" bottom-justify="center">
<div class="top">
Title
</div>
<div class="bottom">
<a data-route="contact" href="contact">
<span>Contact</span>
</a>
</div>
</paper-toolbar>
I had to:
change the bottomJustify to bottom-justify
remove the "title" class and instead use the "top" class

In your code you should use bottom-justify instead of bottomJustify to set the attribute!

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