3.5 em is about 56px.
By the way, are you trying to move your content right inside the curve? IF so, that is not possible because the curve is an image and it has a flat bottom whereas the top is curved. Based on what I see on your front page, that is as close as you are going to get it. The red line in the screenshot here shows where the bottom of the curved image is.
celestial-top.jpg
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