body {
    margin: 0;
    height: 100vh;
    animation: colorChange 10s infinite;
    background-size: 400% 400%;
    text-align: center;
    
     
   }
   @keyframes colorChange {
    0%   { background-color: #ffffff; }
    25%  { background-color: #ff9939; }
    50%  { background-color: #fdff86; }
    75%  { background-color: #49ff95; }
    100% { background-color: #4df9ff; }
   }
   .button4 {
    background-color: white;
    color: black;
    border: 2px solid #e7e7e7;
    border-radius: 20px;
    font-size: 15px;
    padding: 12px 20px;
    text-align: center;
  }
  
  .button4:hover {background-color: #aea2a2;}
  
  .obrazek1 {
 width: 30%;
 text-align: center;
 margin-top: 40px;
  }
  .table { 
    text-align: center;
    border: 1px solid black;
    width: 30px;
  }
  td, th {
    
    padding: 10px 20px;
    text-align: center;
  }
  .obrazek2 {
    width: 70%;
  }
  .obrazek3 {
    width: 50%;
    text-align: center;
  }
  .obr {
    width: 30%;
  }
  .obr1 {
    width: 27%;
  }
  .obrazek4 {
    width: 30%;
  }