#pojemnik
{ 
text-align: center;
width: 1000px; 
height: 500px;
}
 
#linki
{
    float: left;
    text-align:left;
    font-size: 20px;
    width: 20%;
    height: 500px;
    background-image: linear-gradient(to bottom, black, red);
}
 
#tresc_strony
{
    float: left;
    width: 80%;
    height:500px;
    background-image: linear-gradient(to bottom, black, red);
}
 
#baner
{
    height: 100px;
    background-image: linear-gradient(to right red, black);
    font-family:georgia;
    font-size: 50px;
    color: red;
}