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HTML

              
                <div class="info">Lorem ipsum dolor sit amet consectetur adipisicing elit. Obcaecati a deserunt distinctio vitae!
      Dolores officiis animi ab ut officia consequuntur fuga, possimus et eligendi, facilis libero nulla repellat modi
      magnam!
    </div>
<div id="map"></div>
              
            
!

CSS

              
                * {
  margin: 0;
  padding: 0
}

html {
  height: 100%
}

body,
html,
#map {
  height: 100%;
  margin: 0;
  padding: 0
}

.info {
  position: absolute;
  z-index: 999;
  border: 2px solid #0084ff;
  top: 10px;
  left: 10px;
  bottom: 10px;
  width: 30%;
  background: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 10px 10px rgba(0, 140, 255, 0.2);
  overflow: hidden;
}
              
            
!

JS

              
                /**
 * fitBounds with padding
 */

// config map
let config = {
  minZoom: 7,
  maxZomm: 18,
  zoomControl: false // zoom control off
};
// magnification with which the map will start
const zoom = 18;
// co-ordinates
const lat = 52.2297700;
const lon = 21.0117800;

// calling map
const map = L.map('map', config).setView([lat, lon], zoom);

// Used to load and display tile layers on the map
// Most tile servers require attribution, which you can set under `Layer`
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
  attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

// reactivate zoom at the desired location
// [topleft, topright, bottomleft, bottomright]
L.control.zoom({ position: 'topright' }).addTo(map);

function fitBoundsPadding() {
  // get with info div
  const boxInfoWith = document.querySelector('.info').offsetWidth;

  // one marker
const marker = L.marker([lat, lon]).bindPopup('Center Warsaw');

  
  // create a feature group, optionally given an initial set of layers
  const featureGroup = L.featureGroup([marker]).addTo(map);

  // sets a map view that contains the given geographical bounds
  // with the maximum zoom level possible
  map.fitBounds(featureGroup.getBounds(), {
    // https://leafletjs.com/reference-1.6.0.html#fitbounds-options-paddingtopleft
    'paddingTopLeft': [boxInfoWith + 10, 10]
  });
}

// trigger function on dom content loaded
window.addEventListener('DOMContentLoaded', fitBoundsPadding);

// trigger function resize window with performant on resize
let timeout;
window.addEventListener('resize', () => {
  clearTimeout(timeout);
  timeout = setTimeout(() => {
    fitBoundsPadding();
  }, 75);
}, false);
              
            
!
999px

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