body {
    font-family: Arial, sans-serif;
}
.container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}
.input-group {
    margin-bottom: 10px;
}
label {
    display: block;
    margin-bottom: 5px;
}
input[type="number"] {
    width: 100%;
    padding: 8px;
    border-radius: 3px;
    border: 1px solid #ccc;
}
button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 3px;
    cursor: pointer;
}
h2{
    text-align: center;
}