Change color of react-big-calendar events

Additional tip on how to style different kinds of events: In the myEvents array of event objects, I gave each object a boolean property isMine, then I defined:

<BigCalendar

  // other props here

  eventPropGetter={
    (event, start, end, isSelected) => {
      let newStyle = {
        backgroundColor: "lightgrey",
        color: 'black',
        borderRadius: "0px",
        border: "none"
      };

      if (event.isMine){
        newStyle.backgroundColor = "lightgreen"
      }

      return {
        className: "",
        style: newStyle
      };
    }
  }
/>

Sorry, I haven't read the documentation really well. It can be done with the help of eventPropGetter attribute. I've made it like this:

eventStyleGetter: function(event, start, end, isSelected) {
    console.log(event);
    var backgroundColor = '#' + event.hexColor;
    var style = {
        backgroundColor: backgroundColor,
        borderRadius: '0px',
        opacity: 0.8,
        color: 'black',
        border: '0px',
        display: 'block'
    };
    return {
        style: style
    };
},

render: function () {

    return (
        <Layout active="plan" title="Planning">
            <div className="content-app fixed-header">
                <div className="app-body">
                    <div className="box">
                        <BigCalendar
                            events={this.events}
                            defaultDate={new Date()}
                            defaultView='week'
                            views={[]}
                            onSelectSlot={(this.slotSelected)}
                            onSelectEvent={(this.eventSelected)}
                            eventPropGetter={(this.eventStyleGetter)}
                            />
                    </div>
                </div>
            </div>
        </Layout>
    );
}

This solution is simple !

eventPropGetter={(event) => {
  const backgroundColor = event.allday ? 'yellow' : 'blue';
  return { style: { backgroundColor } }
}}

change the condition according to your need and it is done.