The ballots used when voting upon any such proposed ordinance shall state the title of the ordinance to be voted on and below it the two propositions, “For the Ordinance” and “Against the Ordinance.” Immediately at the left of each proposition there shall be a square in which by making a cross (X) the voter may vote for or against the proposed ordinance. If a majority of the electors voting on any such proposed ordinance shall vote in favor thereof, it shall thereupon become an ordinance of the city.