.dca-calculator {
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
    background: #f5f5f5;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 15px;
}

#results {
    margin-top: 20px;
    padding: 15px;
    background: #fff;
    border-radius: 4px;
}