Create Wide Blogger Columns

• Log In
  
• Layout
  
• Edit HTML
  
• Download Full Template (Optional)
  
• Ctrl+F and search for #outer-wrapper {
  
• Directly under that, change the width from 660 px to 970 px (You have just now moved the columns apart.)
  
• Next, Ctrl+F and search for #main-wrapper {
  
• Change the width from 410 px to 650 px (You made the Main Posts column wider.)
  
• Finally, Ctrl+F and search for #sidebar-wrapper {
  
• Change the width from 220 px to 300 px (You made the Sidebar column wider.)
  
• Save template