body {
    font-family: Arial, sans-serif;
}
.keypad-container {
    background: #fff;
    padding: 10px;
    border-radius: 15px;
    width: 250px;
}
.buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
}
button {
    padding: 15px;
    font-size: 18px;
    border: none;
    border-radius: 15px;
    background: #ddd;
    cursor: pointer;
    transition: background 0.2s;
}
button:hover {
    background: #bbb;
}
button:active {
    background: #999;
}
.wide {
grid-column: span 2;
}