<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.css" />
    <link rel="stylesheet" href="http://leaflet.github.io/Leaflet.label/leaflet.label.css" />
    <link rel="stylesheet" href="style.css" />
    <script src="http://code.jquery.com/jquery-2.0.3.min.js"></script>
  </head>

  <body>
    <div id="container">
      <div id="infobox">
        <div id="features">
          <h3>Sidebar header</h3>
        </div>
      </div>
      <div class="map-wrapper">
        <div id="map"></div>
      </div>
    </div>
    <script src="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet-src.js"></script>
    <script src="http://leaflet.github.io/Leaflet.label/leaflet.label.js"></script>
    <script src="script.js"></script>
  </body>
</html>

jQuery(document).ready(main)

function main() {
  var map = L.map('map', {}).setView([49.5, 16], 14);

  L.tileLayer('http://tile.openstreetmap.org/{z}/{x}/{y}.png', {
    maxZoom: 16,
    atribution: 'Map data &copy; OSM.org'
  }).addTo(map);

  var marker = L.marker(L.latLng(49.5, 16)).bindPopup('my custom popup').bindLabel('my custom label');
  map.addLayer(marker);
}

html, body, #container {
  height: 100%;
  overflow: hidden;
  width: 100%;
  margin: 0;
  padding: 0;
}
#infobox {
  position: absolute;
  right: 10;
  top: 10;
  height: 400px;
  width: 150px;
  z-index: 4;
  background: white;
}

#container {
  position: relative;
}
.map-wrapper {
  position: static;
  z-index: 5;
}

.map-wrapper,
#map {
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  height: 100%;
  width: auto;
}

Leaflet map with navbar and sidebar based on https://github.com/bmcbride/bootleaf