Documentation :

<script>
$('#demo').WS_ScroLi({
    validEnd : {
        status  : true,
        icon    : 'fas fa-check'
    },
    // you can enter any selector you want and assign it an icon from fontawesome library
    sections : [
        [ '#section_1', 'fas fa-info' ],
        [ '#section_2', 'fas fa-stream' ],
        [ '#section_3', 'far fa-user' ],
        [ '#section_4', 'fas fa-exclamation' ]
    ],
    position : {
        x : ['left', 10],
        y : ['top', 20]
    },
    icon : {
        size        : 30,
        borderWidth : 1,
        borderRadius: 100,
        color       : 'black',
        colorPast   : 'black',
        colorOff    : 'lightgrey'
    },
    line : {
        height      : 30,
        width       : 3,
        color       : 'black',
        colorPast   : 'black',
        colorOff    : 'lightgrey',
    }
});
</script>