I want to center my image but I don't know how. This is my code.
        text ={
           fontWeight: 'bold'
         }
        screenColor ={
         background: 'lightblue',
         height: 800,
         weight: 500
       }
        render() {
           return(
               <nav className="nav" style={{
                background: 'lightblue',
                height:800,
                weight:600,
                margin: '20 20 0 10',
                padding: '10 10 0 10'
                 }}  >
              <div className="container" style={this.screenColor}>
              <div style={this.text}>Welcome - Programming 3 2019 </div>
              <br></br>
           <img  src={net} style={{
            justifyContent: 'center',
            alignItems: 'center'}}   //These lines from img tag didn't work except src and alt.
             alt="fireSpot"/>
             </div>;
             </nav>
                 )
                   }
                   }
How can I center an image?, I need to solve this. I want to center an image. I'm using react but I need to center the image respect to position.
By other way I want to getting image to lower height.
 
    