body {
    font-family: Palatino;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
    margin: 0;
}
.container {
    text-align: center;
}
.keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    max-width: 400px;
    padding: 10px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin: auto;
}
.keypad button {
    padding: 20px;
    font-size: 50px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background-color: #808080; /* Rot */
    color: #fff;
    transition: background-color 0.3s;
}
.keypad button:hover {
    background-color: #cc0000; /* Dunkleres Rot beim Hover */
}
.input-field {
    padding: 10px;
    font-size: 18px;
    width: 100%;
    max-width: 200px;
    margin: 10px auto;
    border: 1px solid #ccc;
    border-radius: 5px;
}