#kalk1, #kalk2, #kalk3, #kalk4{
    width: 400px;
    border: 1pt solid black;
    border-radius: 15px;
    background-color: aqua;
}
input[type="number"] {
    width: 200px;
    height: 30px;
    border: 1px solid #ccc;
    background-color: #f7f7f7;
    color: #333;
    appearance: none;
    text-align: center;
}

input[type="number"]:focus,
input[type="number"]:hover {
    border: 1px solid #999;
}