Header height change using $bar-height variable but menu icon not getting in center from top

Change height of header using $bar-height but navicon cannot comes in center as height is increased. Please check below picture for getting more clear idea what i mean.

You should be able to add some css to the icon or its container to give it some additional height, padding or line-height (if it is an icon font).

yah thanks but is there any pre-defined variable by ionic for simply changes