Sorry for the question, but I am new in bootstrap,
in my user.js file I could not make it work to deploy justify-content-between
Instead my two elements are next to each other like I used justify-content-start

here are my codes: 

```html
<div className="col-md-8 mb-4">

                                <div className = "card" style={isVisible? { backgroundColor : "#88b69f",color : "white"} :null}>
                                    <div className="card-header d-flex justify-content-between">
                                       <h4 className="d-inline" onClick={this.onClickEvent}>{name + "    "} </h4>
                                        <i onClick = {this.ondeleteuser.bind(this, dispatch)} className="far fa-trash-alt"  style={{cursor : "pointer"}}></i>

                                    </div>
                                    {                        
                                        this.state.isVisible ?
                                        <div className="card-body">
                                        <p className="card-text">Maaş : {salary}</p>
                                        <p className="card-text">Departman : {department}</p>

                                        </div>:null
                                    }
                                    </div>
                                </div>

```