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IE9 doesn't understands `vh ` (vertical height) when inside of an `iframe`. Normally IE9 will understand `vh` as the vertical height relative to the viewport, but in an `iframe`, IE9 thinks the vertical height is relative to the size of the whole page. So this fixes that when the site is viewed in the Customizer preview – an `iframe`. Props laurelfulford. Fixes #38722. Built from https://develop.svn.wordpress.org/trunk@39215 git-svn-id: http://core.svn.wordpress.org/trunk@39155 1a063a9b-81f0-0310-95a4-ce76da25c4cd