Tutorial : How To Center Your Sidebar & Post Title

Step 1 :
Dashboard > Design > Edit Html > Tick Expand Widget Templates


Step 2 :
Press Ctrl+F & find that code  


For Sidebar = " h2 {  " 

For Post = " h3.post-title { "  or  " h4 { "

Step 3 :
Insert this code below that code in Step 2

text-align:center;