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HTML

              
                <div id="container"></div>
              
            
!

CSS

              
                body {
  background-image: url(http://c2064.in-berlin.de/fcc/leaderboard-bg.jpg);
  background-size: 100%;
  font-family: "Anonymous Pro", "Courier New", sans-serif;
}

div.world-map {
  position: relative;
  width: 1280px;
  height: 800px;
  margin: 0 auto;
  
  .country {
    fill: #ccc;
    stroke: #888;
  }
  
  .country.selected {
    fill: #99c;
  }
  
  .meteorites {
    fill: rgba(100, 0, 0, 0.2);
    stroke: rgba(100, 0, 0, 0.5);
    strokeWeight: 0.5
  }
  
  .display {
    position: absolute;
    width: 40vh;
    background-color: rgba(120,90,90,0.4);
    border-radius: 3vh;
    text-align: center;
    padding: 1vh;
    font-size: 2vh;
    
    .name {
      font-size: 3vh;
    }
    
    .label {
      font-weight: bold;
    }
  }
  
  
}
              
            
!

JS

              
                // React/Redux Boilerplate with Reducers and Actions

// React /////////////////////////////////////////////////////////
const Component = React.Component;

// Redux /////////////////////////////////////////////////////////
const Provider = ReactRedux.Provider;
const connect = ReactRedux.connect;
const createStore = Redux.createStore;
const combineReducers = Redux.combineReducers;
const bindActionCreators = Redux.bindActionCreators;

// Display //////////////////////////////////////////////////////////////
const Display = ({pos, mass, name, recclass, year, id}) => {
  if( !mass ) {
    console.log("No display.");
    return <div></div>
  } else {
    console.log(pos, name);
    return (
      <div className="display" style={{"top": pos[1], "left": pos[0]+30}}>
        <span className="name"><strong>{name}</strong></span>
        <br />
        <span className="label">Mass: </span><span className="info">{mass/1000} kg</span>
        <br />
        <span className="label">Recclass: </span><span className="info">{recclass}</span>
        <br />
        <span className="label">Year: </span><span className="year">{year.substr(0,4)}</span>
      </div>
    );    
  }
}

// Container / ReduxContainer /////////////////////////////////////////
class WorldMapClass extends Component {
  constructor(props) {
    super(props);
    
    this.state = {
      margin: { top: 50, left: 50, right: 50, bottom: 50 },
      size: null
    };
    
    // Load Meteorite data
    axios.get("https://raw.githubusercontent.com/FreeCodeCamp/ProjectReferenceData/master/meteorite-strike-data.json")
      .then(res => {
        this.props.dataLoaded("meteorites", res);
    });

    // Load world map
    axios.get("https://unpkg.com/world-atlas@1/world/110m.json")
      .then(res => {
        this.props.dataLoaded("world", res);
    });
  }
  
  componentDidMount() {
    this.initMap();    
  }

  componentDidUpdate() {
    this.drawMap();
  }
  
  initMap() {
    // Get width, height and margin
    let {width, height} = d3.select(".world-map").node().getBoundingClientRect(),
        margin = this.state.margin;
    
    // Define a projection (earth is a globe, we need screen coordinates)
    let projection = d3.geoMercator()
      .translate([ width/2, height/2 ])
      .scale(200);

    // Define a "magic" path, that uses the projection to translate all globe lat, long positions into x and y
    let path = d3.geoPath()
      .projection(projection);

    // Then the world map, first with out data
    let worldMap = d3.select(".world-map").append("svg")
            .attr("height", height )
            .attr("width", width )
          .append("g")
            .attr("transform", "translate("+ margin.left +","+ margin.top +")");    

    // Subtract margin from width and height
    width -= margin.left + margin.right;
    height -= margin.top + margin.bottom;

    // Remember this
    this.setState({ width, height, projection, path, worldMap }) 
  }
  
  drawMap() {
    let { worldMap, path, projection } = this.state;

    // No map or no data ... return
    if( !worldMap || !this.props.data.world ) return;
    
    let countries = topojson.feature(this.props.data.world, this.props.data.world.objects.countries).features
    
    worldMap.selectAll(".country")
      .data(countries)
      .enter().append("path")
        .attr("class", "country")
        .attr("d", path);

    worldMap.selectAll(".meteorites")
      .data(this.props.data.meteorites.features)
      .enter().append("circle")
        .attr("class", "meteorites")
        .attr("r", (d) => Math.pow( d.properties.mass, 0.5 ) / 100)
        .attr("cx", (d) => {
          return projection([d.properties.reclong, d.properties.reclat])[0];
        })
        .attr("cy", (d) => {
          return projection([d.properties.reclong, d.properties.reclat])[1];
        })
        .on("mouseover", (d) => {
          d.properties.pos = d3.mouse(this.wrapper);
          this.props.hover(d.properties, true);
        })
        .on("mouseout",  (d) => {
          d.properties.pos = d3.mouse(this.wrapper);
          this.props.hover(d.properties, false)
        });
  }
  
  render() {
    return (
      <div
        className="world-map"
        ref={ wrapper => this.wrapper = wrapper }
      >
        <Display
          className="display"
          pos={this.props.data.selection.pos}
          mass={this.props.data.selection.mass}
          name={this.props.data.selection.name}
          recclass={this.props.data.selection.recclass}
          year={this.props.data.selection.year}
          id={this.props.data.selection.id}
        />
      </div>
    )
  }
}

const WorldMap = connect(
  ({data}) => { return {data}; },
  (dispatch) => bindActionCreators({hover, dataLoaded}, dispatch)
)(WorldMapClass);


// Redux Reducers /////////////////////////////////////////////////////////
const WorldMapReducer = function(state, action) {
  
  if( !state ) {
    var state = {
      meteorites: null,
      world: null,
      selection: { mass: null }
    }
    
    return state;
  }
  
  switch( action.type ) {
  case DATALOADED_ACTION:
      
      let data = action.payload.data.data;
      if( action.payload.type === "meteorites" ) {
        data.features = data.features.sort((a, b) => parseInt(b.properties.mass) - parseInt(a.properties.mass))
        console.log(data);
      }
      
      let state = { ...state };
      state[action.payload.type] = data;
      return state;
  case HOVER_ACTION:
      if( action.payload ) return { ...state, selection: action.payload };
      else                 return { ...state, selection: { mass: null } };
  }
  
  return state;
}

const rootReducer = combineReducers({
  data: WorldMapReducer  
});

// Redux Actions ////////////////////////////////////////////////////////////
const DATALOADED_ACTION = "DATALOADED_ACTION";
const HOVER_ACTION = "HOVER_ACTION";

function dataLoaded(type, data) {
  return {
    type: DATALOADED_ACTION,
    payload: { type, data }
  }
}

function hover(properties, set) {
  return {
    type: HOVER_ACTION,
    payload: set? properties : null
  }
}


// App ///////////////////////////////////////////////////////////////////////
class App extends Component {
  constructor(props) {
    super(props);
    
    this.state = {
    }        
  }

  render() {
    return (
      <div>
        <WorldMap />
      </div>
    )
  }
}

ReactDOM.render(<Provider store={createStore(rootReducer)}><App /></Provider>, document.getElementById("container"));

              
            
!
999px

Console