body {
    background-color: powderblue;
    text-align: center;
  }
  header {
    background-color: blue;
    font-family: "Lucida Handwriting";
    height: 150px;
    font-size: 40px;
    border: 10px dotted;
  }
  #nav {
    background-color: aqua;
    color: red;
    height: 100px;
    font-size: 40px;
    font-family: "Brush Script MT";
  }
  .artykul {
    background-color: green;
    flex-grow: 2;
    height: 500px;
  }
  .sekcja {
    background-color: red;
    flex-grow: 2;
    height: 300px;
  }
  .bok {
    background-color: purple;
    flex-grow: 1;
    height: 500px;
  }
  footer {
    background-color: yellow;
    height: 120px;
    border: 10px groove;
  }
  menu li {
    list-style-type: none;
    display: inline-block;
    width: 32%;
  }
  menu {
    margin: 0;
    padding: 0;
  }
  main{
    display: flex;
  }