Formatting Cells in Google Sheets

I am trying to format cells in a google sheet based on columns before it in the row. For example, I have check boxes in B1 and C1, if both of them are unchecked (false) I would like D1 to turn red; but only if 2 in a row are unchecked. So if B1 & C1 are unchecked, then D1 is red; but if B1 is checked and C1 is unchecked, I want D1 to still be white. Is there a formula for this?