Vanity sits 14”off the wall. 
When the vanity is installed square and level your top sits 14” off the wall. There is no included backslash to cover this gap. The manufacturer should mount the top 14” further back or ship it detached and let the custumer mount it to the base. 

A simple solution which worked for me was to remove the back cover of the vanity. This allowed it to sit flush. Now you see the wall through the back of the vanity though. It doesn’t bother me but nay bother some.