Untitled

  #logo
  {
width:720px;
height:80px;
background-color:blue;
margin:10px 50px 0px 240px;
  }
  #lewo
  {
border:1px solid blue;
background-color:black;
width:248px;
height:30%;
float:left;
margin-left:240px;

  }
  #prawo
  {
border:1px solid blue;
background-color:black;
width:468px;
height:30%;
float:left;

  }


<head>
<link href="skrypt.css" rel="stylesheet" type="text/css">
<title>proste dzialanie</title>
</head>
<body>
<div id="logo"></div>
<div id="lewo"></div>
<div id="prawo"></div>
</body>