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HTML

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!DOCTYPE html>
<html>

<head>
  <meta name="description" content="Leaflet Template">
  <title>Simple Map</title>
  <meta name="viewport" content="initial-scale=1.0">
  <meta charset="utf-8">
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css" />
</head>
<body>
  <div id="map"></div>
</body>
 <script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js"></script>
</html>
!

CSS 

              
                /* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

.popup-content {
  width: 300px;
}
		
.popup-content .left {
  float:left;
  width: 40%;
}
.popup-content .left img {
  width:100%;
  height:100px;
  margin: -11px 0 -15px -20px;
  border-radius:12px;
}

.popup-content .right {
  float:left;
  width: 60%;
}

.clearfix {
  clear:both;
}
!

JS 

              
                var map = L.map('map').setView([21.02014554822514, 105.784259312448], 13);

L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
  attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

 // Add custom marker
var markerCoord = [21.02014554822514, 105.784259312448]; // Toạ độ marker
var popupOption = {
  className: "popup-content",
  closeOnClick: false
};
 var popupContent = `
 <div class='left'>
     <img src='https://cellphones.com.vn/sforum/wp-content/uploads/2018/11/2-8.png' />
 </div>
 <div class='right'>
     <p>"<strong>Hello Everyone!</strong> <br> Welcome to my map!!!!"</p>
 </div>
 <div class='clearfix'></div>`;

var marker = L.marker(markerCoord).addTo(map);
var inforWindown = L.popup(popupOption)
.setLatLng(marker.getLatLng())
.setContent(popupContent);
marker.bindPopup(inforWindown);
inforWindown.openOn(map);
marker.bindTooltip("Tooltip !!!");
!
999px

Console