Read this article and answer this question After a huge road win, the Steelers returned home for a game against the Jaguars.  In the first quarter the Steelers scored first as Chris Boswell kicked a 29-yard field goal for a 3-0 lead and the only score of the period.  In the second quarter, the Jags got on the board when Leonard Fournette ran for a 2-yard touchdown to make it 7-3.  The Steelers drew closer before halftime though as Boswell kicked a 34-yard field goal to make it 7-6.  After the break, the Steelers would retake the lead in the third quarter when Boswell kicked a 20-yard field goal to make it 9-7.  Though the Jags would score 23 unanswered points well into the fourth quarter when Ben Roethlisberger was intercepted twice:  Telvin Smith returned one 28 yards for a touchdown (with a failed PAT) as the Jags moved ahead 13-9.  This would be followed up by a Barry Church interception that was returned 51 yards for a touchdown to make it 20-9 to finish the third quarter.  In the fourth quarter, Jason Myers tacked on a 47-yard field goal to make it 23-9.  Later on, the Steelers' rush defense stalled as Fournette ran for a 90-yard touchdown to make the final score 30-9. With the loss, the Steelers dropped to 3-2.  The 21-point loss was the largest home loss in Mike Tomlin's career as the team's head coach.  Ben Roethlisberger also set a new career high of 5 interceptions in a single game with 2 of them being pick 6s. The team failed to score a touchdown at home for the first time since their 11-10 victory over the Chargers in 2008.
How many points did the Jaguars win by?
21