In the homepage http://unicorn-ui.com/buttons/ displayed by IE11, in the third button group (Royal / Raised), an aliasing effect affect the 1st- and 3rd-button borders, varying at window resize.
Therefore the buttons seem to be in different states.
I couldn't reproduce this issue with Firefox or Chrome so maybe it's an IE bug.
In the homepage http://unicorn-ui.com/buttons/ displayed by IE11, in the third button group (Royal / Raised), an aliasing effect affect the 1st- and 3rd-button borders, varying at window resize.
Therefore the buttons seem to be in different states.
I couldn't reproduce this issue with Firefox or Chrome so maybe it's an IE bug.