footer{bottom:0}.fondo-negro,footer{position:fixed;width:100%;left:0}.fondo-negro{background-color:rgba(0,0,0,.4);top:0;height:100%;z-index:1}.pointer{cursor:pointer}.active{z-index:-1}.center-prog{position:absolute;top:50%;left:50%;z-index:10000}.drop-zone{border:3px dotted #d3d3d3;opacity:.5;color:#666;text-align:center}.file-over{border:3px dotted #1e90ff}