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HTML 

              
                <html>

<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />

  <link rel="stylesheet" href="https://js.arcgis.com/4.24/esri/themes/light/main.css" />
  <script src="https://js.arcgis.com/4.24/"></script>

  <style>
    html,
    body,
    #viewDiv {
      height: 100%;
      width: 100%;
      margin: 20;
      padding: 20;
    }

    .ext-box {
      display: table;
      width: 350px;
      height: 100%;
    }

    .int-box {
      display: table-cell;
      vertical-align: top;
      width: 340px;
      height: 260px;
    }

    .FixedHeightContainer {
      float: left;
      height: 380px;
      width: 230px;
      padding: 3px;
      background: rgb(112, 128, 144, 0.5);
    }

    .header {
      height: 30px;
      padding-top: 5px;
    }

    .geometryResultsdiv {
      height: 345px;
      overflow: auto;
      background: #fff;
      font-size: 8px;
    }

    .menu {
      display: table;
      width: 65%;
      border: 1px solid black;
      border-right: none;
      box-sizing: border-box;
    }

    .menu>div {
      display: table-row;
      background-color: white;
    }

    .menu>div>div {
      border-right: 1px solid black;
      display: table-cell;
      text-align: center;
      vertical-align: middle;
    }

    @media screen and (max-width: 240px) {
      .menu {
        display: block;
        float: left;
        width: auto;
        border: none;
      }

      .menu>div {
        display: block;
      }

      .menu>div>div {
        border: none;
        padding-right: 10px;
        display: block;
        text-align: left;
      }
    }

    .boxpadding {
      padding: 0px 0px 5px 8px;
    }

    .float-container {
      border: 3px solid #fff;
      padding: 2px;
    }

    .float-child1 {
      width: 40%;
      float: left;
      padding: 2px;
    }

    .float-child2 {
      width: 25%;
      float: left;
      padding: 2px;
    }
  </style>

  <script>
    require([
      "esri/Map", "esri/views/MapView", "esri/views/draw/Draw", "esri/Graphic", "esri/geometry/geometryEngine",
      "esri/geometry/support/webMercatorUtils",
      "esri/layers/GraphicsLayer",
    ], (Map, MapView, Draw, Graphic, geometryEngine, webMercatorUtils, GraphicsLayer) => {
      let blayer = new GraphicsLayer({
        id: "layer",
      });
      blayer.opacity = 0.5;
      const map = new Map({
        basemap: "gray-vector",
        layers: [blayer]
      });
      const view = new MapView({
        container: "viewDiv",
        map: map,
        zoom: 10,
        center: [-77.367, 37.55]
      });
      const draw = new Draw({
        view: view
      });
      
      document.getElementById("clear-button").onclick = () => {
        view.graphics.removeAll();
        blayer.removeAll();
      };
      document.getElementById("point-button").onclick = () => {
        const action = draw.create("point");
        //view.focus();
        // action.on("cursor-update", function(evt) {
        //   GraphicPoint(evt.coordinates);
        // });
        action.on("draw-complete", function(evt) {
          GraphicPoint(evt.coordinates);    
        });
      };

      function GraphicPoint(coordinates) {
        view.graphics.removeAll();
        let point = {
          type: "point",
          x: coordinates[0],
          y: coordinates[1],
          spatialReference: view.spatialReference
        };
        const graphic = new Graphic({
          geometry: point,
          symbol: {
            type: "simple-marker",
            style: "circle",
            color: [0, 0, 0, 0.5],
            size: "9px",
          },
        });
        view.graphics.add(graphic);

        BufferGeom(graphic.geometry);

      }

      function BufferGeom(geom) {
        var d = document.getElementById("distance");
        const buffGeom = geometryEngine.geodesicBuffer(
          geom,
          d.value,
          "kilometers"
        );
        const buffgra = new Graphic({
          geometry: buffGeom,
          symbol: {
            type: "simple-fill",
            color: [112, 128, 144, 0],
          },
        })

        // blayer.removeAll();
        blayer.addMany([buffgra]);
        
        d.addEventListener('change', function() {
          const buffGeom = geometryEngine.geodesicBuffer(
            geom,
            d.value,
            "kilometers"
          );
          const buffgra = new Graphic({
            geometry: buffGeom,
            symbol: {
              type: "simple-fill",
              color: [112, 128, 144, 0],
            },
          })
          const buffgra2 = new Graphic({
            geometry: buffGeom,
            symbol: {
              type: "simple-fill",
              color: [112, 128, 144, 0],
            },
          })
          // blayer.removeAll();
          blayer.addMany([buffgra, buffgra2]);
        })
      }
      view.ui.add('point-button', 'top-right')
      view.ui.add('clear-button', 'top-right')
    });
  </script>
</head>

<body>
  <div id="viewDiv">

    <div class="ext-box">
      <div class="int-box">
        <h2 class="boxpadding">Buffer</h2>
        <div class="float-container">
          <div class="float-child2">
            <div class="slider">
              <label for="fader"> Distance</label>
              <input id="distance" type="range" value="3" min="1" max="10" step="0.5" oninput="this.nextElementSibling.value = this.value+'km'" />
              <output>3km</output>
            </div>
          </div>
        </div>
        </br>
        </br></br>
        <div>
          <div id="clear-button" class="esri-widget esri-widget--button esri-interactive" title="Clear Grpahics">
            <span class="esri-icon-erase"></span>
          </div>
          <div id="point-button" class="esri-widget esri-widget--button esri-interactive" title="Draw point">
            <span class="esri-icon-map-pin"></span>
          </div>
        </div>
        </br>
      </div> <!-- End of int box -->
    </div> <!-- End of ent box -->

  </div>
</body>

</html>
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