css

body {

    background-color:#0a6cff;
    width: 100%;
    height: 100%;
    margin: 0;
     padding: 0;



}

#okvir {
width: 1500px;;
height: auto;
margin: 0;
 padding: 0;
}



#lijevo{
width:20%;
height:50px;
border: 2px solid #000000;
display: block;
position: relative;
float: left;
margin: 0;
 padding: 0;
}

#centar{
width:60%;
height: 50px;
border: 2px solid #FF0000;
display: block;
position: relative;
float: left;
margin: 0;
 padding: 0;
}

#desno {
width:20%;
height: 50px;
border: 2px solid #00FF00;
display: block;
position: relative;
float: left;
margin: 0;
 padding: 0;
}