*
{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
.kontener
{
    width: 1000px;
    margin-left: auto;
    margin-right: auto;
}
body
{
background-color: #303030;
}
#baner
{
    background-color: #829EB9;
    height: 100px;
    font-family: Arial;
    text-align: center;
    padding: 20px;
}
#panel_lewy
{
    background-color: #B3C6D9;
    height: 600px;
    width: 25%;
    float:left;
    padding: 20px;
}
#panel_prawy
{
    background-color: #E0E9F1;
    height: 600px;
    width: 75%;
    float:left;
}
#stopka
{
    background-color: #829EB9;
    font-family: Arial;
    text-align: right;
}