Step 1
Log in to Blogger
Step 2
Go to "Design - Edit HTML"
Step 3
Checklist "Expand Widget Templates"
Step 4
Find this code:]]> </ b: skin>
Step 5
Put the following code above the code step 4

::-webkit-scrollbar {height: 12px; width: 12px; background: # 00A000;} ::-webkit-scrollbar-thumb {background-color: # A52A2A;-moz-border-radius: 10px; border-radius: 10px;}

Edit the color codes on the block to taste buddy
Step 6
Click Save Template

Hopefully helpful, Good luck and good luck