body{
background-color: brown;
      font-family:Courier, "Lucida Console", monospace;
  }
  div.Pasek{
    background: url("bg.png") no-repeat center center fixed; 
      text-align: center;
      border: 2px solid white;
      }
      div a {
        text-align:center;
        color: rgb(230, 230, 230);
        font-size: 19px;
        padding: 10px;
        margin: 5px;
        display:inline-block;
       z-index: 7;
      }
      ul {
        display: inline;
        margin: 15px;
        top: 47px;
        padding: 0;
        z-index: 7;
      }
      ul li {display: inline-block;}
      ul li:hover ul {display: block;}
      ul li ul {
        position:absolute;
        width: 190px;
        display: none;
        z-index: 7;
      }
      ul li ul li { 
      display: block; 
      color: white;
      border: 2px solid white;
      z-index: 7;
      }
      ul li ul li a {display:inline-block;} 
      ul li ul li{
        background-color: rgb(0, 0, 0);
        z-index: 7;
      }
      ul li ul li:hover{
        background-color: rgb(154, 0, 0);
        z-index: 7;
      }
  #zegar{
    position: absolute;
    left: 89%;
    top: 2%;
    font-size: 35px;
    color: white;
  }
  .logo{
    position: absolute;
    width: 52px;
    right: 1587px;
    top: 8px;
    border: 2px solid red;
  }
  .logo:hover{
   background-color:rgba(255, 255, 255, 0.5);
   transition: all 0.3s linear 0s;
  }
  .kaczka{
    width:500px;
    height: 300px;
    border: 4px solid rgb(255, 0, 0);
    margin:  20px 50px;
    padding: 5px;
    border-radius: 20px;
    color: black;
font-size: larger;
background-color: white;
}
.przyklad1{
    background-color: white;
}
.przyklad2{
    background-color: white;
}
.przyklad3{
    background-image: url(https://samequizy.pl/wp-content/uploads/2018/03/filing_images_fdc4a96bd066.jpg);
    background-size: 500px 300px;
    background-position: right top;
    background-repeat: round;
    background-attachment: scroll;
    overflow: scroll;
    color: black;
    background-origin: content-box;
}
.przyklad4{
    background-image: url(https://jf-staeulalia.pt/img/other/89/collection-animation-gif.gif);
    background-size: 500px 300px;
    background-position: 50% 50%;  
    background-repeat: round;
}
.przyklad5{
    background-image: radial-gradient(circle, red, yellow, blue);
}