It's an amazing song. It is simple, but still fun to play along to.
-standard tuning-

   INTRO
g|--------------------------------------------------------------------|
d|--------------------------------------------------------------------|
a|--33--33-3----------------33--33-3-------------------------33-33333-|
e|----------33--333--11-11-1--------55--55-533--333--11--11-1---------|

   VERSE

g|-------------------------------------|
d|-------------------------------------|
a|--33333333---------------------------|
e|----------33333333-55555555-33333333-|  x2

   PRE-CHORUS

g|--------------------------------|
d|-----5/------5/----5/-----------|
a|--3------3-3-----3-----3-3----3-|
e|---------------------------135--| x2


   CHORUS
   (part 1)
g|--------------------------------------|
d|--------------------------------------|
a|--3-3--33-3---------------------------|
e|------------3-3--33-31-1--1-13-3--33-3| x2
   
   (part 2)
g|------------------------------------|
d|------------------------------------|
a|---------------------------3-3--33-3|
e|5-5--55-53-3--33-31-1--11-1---------|

g|--------------------------|
d|--------------------------|
a|--------------------/3~~~~|
e|--55-----33-----11--------|

  VERSE x2
  PRE-CHORUS x2
  CHORUS

    BRIDGE

g|--------------------------------|
d|--------------------------------|
a|--3----(3)----------------------|
e|---------3---(3)5-----(5)3------| x6

g|--------|
d|--------|
a|--3~~~~~|
e|--------|

 --rest--

  CHORUS (part 2 only)


  Enjoy! :)