body {
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
    margin: 0;
}

header {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
}

a {
    text-decoration: none;
    color: black;
    margin: 5px 10px;
}

div {
    justify-self: center;
    padding-top: 50px;
    width: 200px;
    height: 200px;
}

@keyframes barvicka {
    from {background-color: red;}
    to {background-color: yellow;}
  }

  #barvicky {
    background-color: red;
    animation: barvicka 4s infinite;
  }

  @keyframes barvickaUprava {
    0%   {background-color: red;}
    25%  {background-color: yellow;}
    50%  {background-color: blue;}
    100% {background-color: green;}
  }

  #crazyBarvicky {
    background-color: red;
    animation: barvickaUprava 4s infinite;
  }

  @keyframes jesteCrazierBarvicka {
    0%   {background-color:red; left:0px; top:0px;}
    25%  {background-color:yellow; left:200px; top:0px;}
    50%  {background-color:blue; left:200px; top:200px;}
    75%  {background-color:green; left:0px; top:200px;}
    100% {background-color:red; left:0px; top:0px;}
  }
  
  #jesteCrazierBarvicky {
    position: relative;
    background-color: red;
    animation: jesteCrazierBarvicka 4s infinite;
  }

  @keyframes rotace {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

  #tociciSeCtverecek {
    background-color: red;
    animation: rotace 2s linear infinite;
  }

  @keyframes pulzace {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.5); opacity: 0.5; }
    100% { transform: scale(1); opacity: 1; }
}

#pulzujiciKolecko {
    background-color: red;
    border-radius: 100%;
    animation: pulzace 2s ease-in-out infinite;
}