Song is more about how its strummed than the actual chords, so you're on your own for that part.
/ - slide
p - pull off

1.5 Steps Down
Intro x1
Db|-0---1---0---1---0---1---0---1--|
Ab|-0---1---0---1---0---1---0---1--|
Fb|-1---2---1---2---1---2---1---2--|
Cb|-2---3---2---3---2---3---2---3--|
Gb|-2---3---2---3---2---3---2---3--|
Db|-0---1---0---1---0---1---0---1--|

Verse x2
Db|-0---1---0---1---1-1-1/3-3--|
Ab|-0---1---0---1---1-1-1/3-3--|
Fb|-1---2---1---2---2-2-2/4-4--|
Cb|-2---3---2---3---3-3-3/5-5--|
Gb|-2---3---2---3---3-3-3/5-5--|
Db|-0---1---0---1---1-1-1/3-3--|

Chorus x2
Db|----------------------------------------------------|
Ab|----------------------------------------------------|
Fb|---------------------------------------5-----3------|
Cb|-2-3-2--2-2--3p2-5/3-6/5---2-3-2--2-2--5-6-3-3-5-3--|
Gb|-2-3-2--2-2--3p2-5/3-6/5---2-3-2--2-2--3-6-3-1-5-3--|
Db|-0-1-0--0-0--1p0-3/1-4/3---0-1-0--0-0----4-1---3-1--|
           .                         . . 
Verse x2
Db|-0---1---0---1---1-1-1/3-3--|
Ab|-0---1---0---1---1-1-1/3-3--|
Fb|-1---2---1---2---2-2-2/4-4--|
Cb|-2---3---2---3---3-3-3/5-5--|
Gb|-2---3---2---3---3-3-3/5-5--|
Db|-0---1---0---1---1-1-1/3-3--|

Chorus x2
Db|----------------------------------------------------|
Ab|----------------------------------------------------|
Fb|---------------------------------------5-----3------|
Cb|-2-3-2--2-2--3p2-5/3-6/5---2-3-2--2-2--5-6-3-3-5-3--|
Gb|-2-3-2--2-2--3p2-5/3-6/5---2-3-2--2-2--3-6-3-1-5-3--|
Db|-0-1-0--0-0--1p0-3/1-4/3---0-1-0--0-0----4-1---3-1--|
           .                         . . 

Bridge x2
Db|-0--1---------------|
Ab|-0--1---------------|
Fb|-1--2--5-----3------|
Cb|-2--3--5-6-3-3-5-3--|
Gb|-2--3--3-6-3-1-5-3--|
Db|-0--1----4-1---3-1--|

Fill x3
Db|-0---1---0---1---0---1---0---1--|
Ab|-0---1---0---1---0---1---0---1--|
Fb|-1---2---1---2---1---2---1---2--|
Cb|-2---3---2---3---2---3---2---3--|
Gb|-2---3---2---3---2---3---2---3--|
Db|-0---1---0---1---0---1---0---1--|