JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://openlayers.org/en/v3.20.1/css/ol.css">
<script src="https://openlayers.org/en/v3.20.1/build/ol.js"></script>
<div id="map" class="map" tabindex="0"></div>
<button id="fit">fit</button>

JavaScript

var map = new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: 'map',
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

// A bounce easing method (from https://github.com/DmitryBaranovskiy/raphael).
function bounce(t) {
  var s = 7.5625, p = 2.75, l;
  if (t < (1 / p)) {
    l = s * t * t;
  } else {
    if (t < (2 / p)) {
      t -= (1.5 / p);
      l = s * t * t + 0.75;
    } else {
      if (t < (2.5 / p)) {
        t -= (2.25 / p);
        l = s * t * t + 0.9375;
      } else {
        t -= (2.625 / p);
        l = s * t * t + 0.984375;
      }
    }
  }
  return l;
}

var animationOptions = {
  duration: 1000,
  easing: bounce
};
  
document.getElementById('fit').onclick = function() {
	var extent = [68.17665, 7.96553, 999997.40256, 355555.49401];
  var view = map.getView();
  view.fit(extent, map.getSize(), animationOptions);
};