What you're adding: https://i.imgur.com/pebrdwK.png
Knowledge: 1/10
Author of preset: https://www.rune-server.ee/members/cael/
Go to your IPB theme edit code/css settings and find custom.css
Enter there this code:
Code:
::-webkit-scrollbar-thumb { background: rgb(157,255,255);
background: -moz-linear-gradient(top, rgba(157,255,255,1) 0%, rgba(61,147,181,1) 100%);
background: -webkit-linear-gradient(top, rgba(157,255,255,1) 0%,rgba(61,147,181,1) 100%);
background: linear-gradient(to bottom, rgba(157,255,255,1) 0%,rgba(61,147,181,1) 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#9dffff', endColorstr='#3d93b5',GradientType=0 );
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
border-radius: 3px;
cursor: pointer;
}
::-webkit-scrollbar-track {
background-color: #192331;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
border-radius: 3px;
width: 6px;
border-left: 1px solid #192331;
}
::-webkit-scrollbar {
width: 6px;
background-color: #192331;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
border-radius: 3px;
}
And save.