Missing indent before Proof

[Vertmo]

This is a detail, but with the current HTML generation, the first line of Proof located under Module or Section are not properly indented. For instance:

Module MyMod.
  Lemma taut: forall A : Prop, A -> A.
  Proof.
    auto.
  Qed.
End MyMod.

Is exported as:

Here is the result after my modifications:

The Qed line is still a bit skewed to the left (due to the proof script being in a smaller font), which is bothering me, but I'm not sure how to fix it...