body {
    background-color: #f2f2f2;
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

h2 {
    color: #2c3e50;
    font-size: 2em;
    margin-bottom: 20px;
}

form {
    background-color: #ffffff;
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="number"],
input[readonly],
select {
    font-size: 1.5em;
    padding: 10px;
    width: 80px;
    text-align: center;
    border: 1px solid #ccc;
    border-radius: 5px;
}

#result {
    width: 120px;
}

button {
    font-size: 1.5em;
    padding: 10px 20px;
    background-color: #34495e;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #2c3e50;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    -moz-appearance: textfield;
}