html - White lines in OSM (OpenLayers) -

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i have piece of code in jsp show map using osm (openstreetmap, collaborative project create free editable map of world) see white lines in map

<div class="windowcontentmap" >     <div id="map" style="width: 97%; height: 94%"></div>                         <script src="http://www.openlayers.org/api/openlayers.js"></script>                         <script>                             var lat            = '${lat}';                             var lon            = '${lng}';                             var zoom           =  9;                              var fromprojection = new openlayers.projection("epsg:4326");   // transform wgs 1984                             var toprojection   = new openlayers.projection("epsg:900913"); // spherical mercator projection                             var position       = new openlayers.lonlat(lon, lat).transform( fromprojection, toprojection);                              map = new openlayers.map("map");                             var mapnik         = new openlayers.layer.osm();                             map.addlayer(mapnik);                              var markers = new openlayers.layer.markers( "markers" );                             map.addlayer(markers);                             markers.addmarker(new openlayers.marker(position));                             map.setcenter(position, zoom);                              var mylocation = new openlayers.geometry.point(lon, lat).transform('epsg:4326', 'epsg:3857');                          </script>                      </div> </div>   .windowcontentmap div{     height: 334px;     display: block;     border-left: 1px solid #efefef;     border-right: 1px solid #efefef; }

enter image description here

i suspect problem css, not js/openlayers.

try 

  
#map {     height: 334px;     display: block;     border-left: 1px solid #efefef;     border-right: 1px solid #efefef; }

you giving border divs children of div.windowcontentmap , divs created openlayers getting border.


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