Change your scroll to:
overflow-y: auto;
Setting it to auto will display the scrollbar if its needed only, while scroll suggests there should always be a scrollbar.
You can play around with different overflow propertys using this example or read more about it at the w3schools.
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Although you could consider using the -ms-overflow-style property, which you can find in the windows dev center:
-ms-overflow-style: auto | none | scrollbar | -ms-autohiding-scrollbar