body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
}

.container {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    margin-bottom: 1.5rem;
}

.input-group {
    margin-bottom: 1rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
}

input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}

#result {
    margin-top: 2rem;
    text-align: left;
}

.bmi-score {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: #e7f3ff;
    border-radius: 4px;
    border-left: 4px solid #007bff;
}

.bmi-ranges {
    font-size: 0.9rem;
    color: #555;
    background-color: #f9f9f9;
    padding: 1rem;
    border-radius: 4px;
}

.bmi-ranges h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.bmi-ranges ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.bmi-ranges li {
    padding: 0.25rem 0;
}

.error {
    color: #dc3545;
    font-weight: bold;
    text-align: center;
}