body {
    font-family: Helvetica, sans-serif;
    background-color: #f2f2f2;
    margin: 0;
    padding: 0;
    display: center;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.calculator {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    padding: 20px;
    text-align: center;
}

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

.input-container {
    margin-bottom: 20px;
}

label {
    font-weight: bold;
}

input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 16px;
}

.result-container {
    margin-top: 20px;
}

#result {
    font-weight: bold;
}

#toilets-needed {
    color: #007bff;
    font-size: 24px;
}