.eco-estimator {
    border: 1px solid #ccc;
    padding: 15px;
    max-width: 500px;
    background: #f0f8ff;
}
.eco-estimator input {
    margin-bottom: 10px;
    width: 100%;
    padding: 5px;
}
.eco-estimator button {
    padding: 10px;
    background: #28a745;
    color: #fff;
    border: none;
    cursor: pointer;
}
.eco-estimator button:hover {
    background: #218838;
}
#eco_result {
    margin-top: 15px;
    background: #e6ffe6;
    padding: 10px;
    border-left: 5px solid #4caf50;
}