* {
    box-sizing: border-box;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
}

h1 {
    text-align: center;
    font-size: 48px;
}

#calculator {
    display: flex;
    flex-direction: column;
    align-items: center;

    width: 350px;
    padding: 16px;
    margin: 0 auto;

    background-color: rgb(190, 190, 190);
    border: 6px solid black;
    border-radius: 10px;

    gap: 16px;
}

#display {
    text-align: right;
    font-size: 24px;
    font-weight: bold;
    width: 250px;
    background-color: rgba(194, 255, 102, 0.63);

    padding: 4px;
}

#keypad {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.row {
    width: 100%;
}

button {
    flex: none;
    width: 60px;
    height: 40px;
    font-size: 18px;
    font-weight: bold;
    border-radius: 5px;
}