How to fix shifting header after installing speed / cache plugins?

i found this CSS:
@media only screen and (min-width: 800px) { .no-overflow-y body { padding-right: 9px !important; } }

and changed it to
@media only screen and (min-width: 800px) { .no-overflow-y body { padding-right: 0px !important; } }

and that solved the issue.