\layout { 
  indent = 0
  ragged-right = ##f 
}

{
  % Metronome marks below the staff 
  \override Score.MetronomeMark.direction = #DOWN
  \tempo 8. = 120
  c''1

  % Rehearsal marks below the staff
  \override Score.RehearsalMark.direction = #DOWN
  \mark \default
  c''1
}