CSS to show custom scrollbar for EUI

CSS to show custom scrollbar for EUI:

div.surveysparrow-chat__split-layer-top{
-ms-overflow-style: auto;
overflow-y: auto;
scrollbar-width: auto;
}
div.surveysparrow-chat__split-layer-top::-webkit-scrollbar {
background: #eaeaea !important;
width: 10px !important;
display: block !important;
}
div.surveysparrow-chat__split-layer-top::-webkit-scrollbar-track {
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3) !important;
border-radius: 0 !important;
display: block !important;
background: #eaeaea !important;
}
div.surveysparrow-chat__split-layer-top::-webkit-scrollbar-thumb {
border-radius: 10px !important;
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5) !important;
display: block !important;
}