#tahvel{
    background-color: lightgreen;
    width: 40%;
    height:30%;
}
h1{
    background-color: royalblue;
    color:red;
    border-color: lightgreen;
    text-align: center;
    font-family: serif, "Times New Roman";
}
input[type=button]{
    background-color: green;
    color: yellow;
    padding: 20px 32px;
    border:0;
}
input[type=button]:hover{
    background-color: brown;
}