#ecommerce-profit-calculator {
    font-family: Arial, sans-serif;
    max-width: 700px;
    margin: auto;
}

.section {
    margin-bottom: 2em;
    border-bottom: 1px solid #ddd;
    padding-bottom: 1em;
}

label {
    display: block;
    margin-top: 1em;
}

input,
select {
    width: 100%;
    padding: 8px; 
    margin-top: 5px;
}

.results {
    background: #f5f5f5;
    padding: 15px;
    margin-top: 20px;
    font-weight: bold;
}

button {
    padding: 10px 20px;
    margin-top: 10px;
}