.boat-calculator {
    max-width: 400px;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 6px;
}

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

.boat-calculator input {
    width: 100%;
    padding: 8px;
}

.boat-calculator button {
    padding: 10px 15px;
    cursor: pointer;
}

.boat-calculator .results {
    margin-top: 20px;
}