/* Add this meta tag to fix the viewport */
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">

.container {
    max-width: 400px;
    margin: 0 auto;
}

body {
    font-family: Arial, sans-serif;
    background-color: #FFFCF9;
    color: #333;
    text-align: center;
    padding: 20px;
}

h1 {
    font-size: 24px;
    color: #FF4500;
    margin-bottom: 20px;
}

label, p {
    font-size: 16px;
    color: #333;
}

input {
    margin: 10px 0;
    padding: 10px;
    font-size: 16px;
}

button {
    background-color: #FF4500;
    color: white;
    border: none;
    padding: 12px 24px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 14px;
    margin: 10px 2px;
    cursor: pointer;
}

#remaining_days {
    font-size: 18px;
    font-weight: bold;
    color: #FF4500;
    margin-top: 20px;
}

#lifespan_chart {
    max-width: 100%;
    height: auto;
    margin: 30px auto;
}