You’ll have to add this with either an external CSS stylesheet. The nth-child(even) doesn’t work for inlines styling unfortunately.
border-collapse does not make the component collapsable, it just specifies the spacing (see border-collapse | CSS-Tricks - CSS-Tricks). If this is indeed the property that you want to set, you’ll need to apply it on the Table component rather than the parent Div component.
Setting overflow-x and overflow-y to scroll along with a fixed width and height all inside the style attribute of the container Div or Table should so this for you.
Note that I’m also working on a more interactive table component, see the discussion here: Display tables in Dash - #36 by Sherm4nLC