:root {
  --dark: #444444;
  --light: #f1f1f1;
}

body {
    margin: 0px;
    padding: 0px;
}

.menu {
  float:left;
  display: inline;
  position: sticky;
  top: 10px;
  left: 10px;
  font-size: 2rem;
}

.menu:hover {
  cursor: pointer;
}

.menu:active {
  top:12px;
}

.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  right: 0;
  overflow-x: hidden;
  background-color: var(--light);
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
  text-decoration: none;
  color:var(--dark);
  font-size: 2.5rem;
}

.sidenav .closebtn:active {
  top: 2px;
}

nav ul {
    position: fixed;
    top: 0;
    width: 200px;
    height: 100%;
    overflow: auto;
    background-color: var(--light);
    list-style-type: none;
    margin: 0;
    padding: 0;
    padding-top: 30px;
  }

nav ul li {
    width: 100px;
    margin-left:auto;
    margin-right: auto;
    margin-top: 10px;
    margin-bottom: 10px;
    padding: 8px;
}

  nav ul a {
    text-decoration: none;
    color: var(--dark);
    font-size: 1.6rem;
  }

  nav ul li:hover {
      background-color: darkgrey;
  }

  .container {
      column-count: 3;
  }

  article {
      padding: 30px;
  }

  header {
      position: sticky;
      top: 0;
      background-color: #f0f0f0;
      height: 80px;
  }

  .title {
      position: relative;
      top: 20%;
      width:200px;
      margin-left: auto;
      margin-right: auto;
      text-align: center;
      padding-top:10px;
      font-size: 1.75rem;
  }

.swan-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 600px;    
}

  #img-swan {
    width: 400px;
  }


  .grid-container {
      display: grid;
      grid-template-columns: 1fr 2fr 1fr;
  }

  @media only screen and (max-width: 600px) {
    .sidenav {
      padding-top: 15px;
    }
    
    .container {
        column-count: 1;
    }

    .grid-container {
        display: grid;
        grid-template-columns: 1fr;
    }
  }