Round Scrollbar

- Dashboard > Design > Edit HTML
- Find this code :

]]></b:skin>

- Copy this code n paste BEFORE code that u find just now :

 ::-webkit-scrollbar-thumb:vertical {
background-color:#fff;
-moz-border-radius:10px;
-webkit-border-radius:10px;
}
 ::-webkit-scrollbar {
width:7px;
height:5px;
background-color:#000;
}

RED - change this numb as u like (size)
BLUE - colour of border HERE 

- Save !