#kalk1, #kalk2, #kalk3{
    width: 400px;
    height: 200px;
    border: 1pt solid blue;
    border-radius: 10px;
    background-color: cyan;
    text-align: center;
}
input[type="number"] {
    width: 60px;
    height: 30px;
    border: 1px solid white;
    background-color: cornflowerblue;
    appearance: none;
}