Search results cover search input + bleed through top of viewport

[22a]

Go to https://ember-learn.github.io/ember-cli-addon-docs/ and search for addon,
notice the search results ember-modal-dialog varies drastically in height as we travel through:

• a
• ad
• add
• addo
• addon

Perhaps this search results modal should be a fixed height and allow overflow in the Y axis to scroll?