Didn't find the correct solution. So, after 2 hours trying to solve, the solution that worked for me is: .ui-panel { background : rgba(0, 0, 0, 0.85); overflow: hidden; width: 35% !important; } ::-webkit-scrollbar { width: 0px; } .ui-panel-content-fixed-toolbar-position-left.ui-panel-content-fixed-t...