style.css

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #1d1d1d;
    overflow: hidden; /* Prevent scrolling */
}

.numpad-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 350px;
    height: 100%; /* Ensure it takes full screen height */
    box-sizing: border-box;
}

#numpad-display {
    width: 100%;
    height: 8vh;
    font-size: 4vh;
    text-align: right;
    margin-bottom: 10px;
    padding: 5px;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

.numpad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: 100%;
    max-height: calc(100% - 10vh); /* Prevent overflow */
    overflow-y: auto; /* Enable scrolling if necessary */
    box-sizing: border-box;
}

/* Change grid layout for buttons */
.numpad-btn {
    padding: 3vh; /* Adjust padding for better fit */
    font-size: 4vh;
    cursor: pointer;
    background-color: #ddd;
    border: none;
    border-radius: 5px;
    transition: background-color 0.2s;
    touch-action: manipulation;
}

.numpad-btn:hover {
    background-color: #ccc;
}

/* Add a new row for clear, backspace, and enter buttons */
#clear, #backspace, #enter {
    grid-column: span 3; /* Make them span full width */
}

/* For smaller screen sizes */
@media (max-width: 600px) {
    #numpad-display {
        font-size: 3.5vh;
    }
    
    .numpad-btn {
        padding: 2.5vh; /* Adjust padding for smaller screens */
        font-size: 3.5vh;
    }
}

@media (max-width: 400px) {
    #numpad-display {
        font-size: 3vh;
    }
    
    .numpad-btn {
        padding: 2vh; /* Adjust padding for smaller screens */
        font-size: 3vh;
    }
}