You can create div, set the height in 100%and use overflow-y:auto;.
If you copy this code and paste it into your project, you will see that this is what you are looking for.
Please use this with caution, I personally like that chrome hides the navigation bar. Also, in the future, keep in mind that if you accept an answer that does not really answer your question, no one else will let him go.
Example:
html, body {
height:100%;
}
.customnavigation {
height:100%;
overflow-y:auto;
}
<div class="customnavigation">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
<img src="http://placehold.it/150x150">
</div>
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