* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    background: #f3f3f3;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background: #ffffff;
    width: 400px;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
}

.container h2 {
    margin-bottom: 15px;
    text-align: center;
    color: #333;
}

input[type="number"] {
    width: 100%;
    padding: 10px;
    font-size: 16px;
    border: 2px solid #ddd;
    border-radius: 5px;
    margin-bottom: 15px;
}

input[type="number"]:focus {
    border-color: #4a90e2;
    outline: none;
}

button {
    width: 100%;
    padding: 10px;
    background: #4a90e2;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
}

button:hover {
    background: #357ABD;
}

.container div {
    font-size: 18px;
    line-height: 1.5;
}