#tahvel{
    background-color: lightblue;
    width: 50%;
    height: 50%;
    border-radius: 20px;
}
h1{
  color: black;
  background-color: lightblue;
  border-top: 3pt solid steelblue;
  border-bottom: 3pt solid steelblue;
  border-radius: 20px;
  padding: 3px;
}
input[type=button]{
      background-color: lightblue;
      color: black;
      padding: 20px 20px;
      border:1;
}
input[type=button]:hover{
    background-color: steelblue;
}