Fix hover shadow on toasts

[snide]

With the new shadows, the toasts would look weird on hover because the overflow would cut them off. This adds some left padding so they will continue to show.

[cchaos]

LGTM, sorry I didn't catch that hover effect.

Can you update the docs where it gives a width on the toast's container to a max-width instead? On mobile it goes off screen and pushes the layout.