Checkout now button overlaps with Cart item container

[machikoyasuda]

Expected v. Actual: Screenshots

Comparing 1.7 (https://swag.getreaction.io/) to 1.8 (release-1.8.0 branch)

Expected behavior

The Checkout now button should not overlap with the Cart item containers

Actual behavior

The Checkout now button overlaps with the Cart item containers

Steps to reproduce the behavior

1. Add item to cart
2. Click cart
3. Observe cart

Versions

Node: 8.2.1
NPM: 5.6.0
Meteor Node: 8.9.3
Meteor NPM: 5.5.1
Reaction CLI: 0.27.0
Reaction: 1.8.0
Reaction branch: release-1.8.0
Docker: 17.09.0-ce

Browser: http://whatismybrowser.com/w/KE449ZE

QA

QA by @willopez + @machikoyasuda