How to add scrollbar to aura:iteration component

I'm using an aura:iteration component to display a list of items in a lightning component. I'd like to only show a maximum of 5 list items at a time with a scrollbar to access the rest, but I can't figure out how to add a scrollbar to the component.

<aura:component controller="geolocationAccountController">
    <aura:registerEvent name="accountsLoaded" type="c:geoAccountsLoaded"/>
    <aura:attribute name="accounts" type="Account[]"/>
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
    
    <aura:iteration items="{!v.accounts}" var="account">
        <c:geoAccountListItem account="{!account}"/>
    </aura:iteration>
</aura:component>