Make your window an inch or two bigger than than the width of one inline-block: all inline-blocks should be the same size. Try resizing the window so that inline-blocks wrap in one or two columns.

this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block this is an inline-block