Answer posted by Dan Letecky [DayPilot] 6 years ago.
It looks like you are using global CSS that interferes with the calendar CSS. Try disabling it temporarily and then enable it section by section to see what affects the positioning. It will be something like box-sizing, padding, etc.
Comment posted by Akhtar Raza 6 years ago.
you are right but while going down the box going above half of the line.
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