General solution for your openlayers map in client side should be something
like that (tested for google map but should work for every kind of base map
that you are using):
var maxExtentG=map.getMaxExtent().toGeometry();
var feat = new OpenLayers.Feature.Vector(maxExtentG, {});
var lStyle = OpenLayers.Util.extend({},
OpenLayers.Feature.Vector.style['default']);
lStyle.fillOpacity = 0;
lStyle.strokeColor="black";
lStyle.strokeWidth=13;
var worldExtentBorders = new
OpenLayers.Layer.Vector("worldExtentBorders",{style: lStyle});
worldExtentBorders.addFeatures(feat);
map.addLayer(worldExtentBorders);
--
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