.expandable-button {
    background-color: #f1f1f1;
    color: #333;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    transition: 0.4s;
    margin-bottom: 10px;
}

.expandable-button:hover {
    background-color: #ddd;
}

.expandable-content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: #f9f9f9;
    margin-bottom: 10px;
}

.back-button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin-top: 20px;
    cursor: pointer;
    border-radius: 5px;
    margin-right: 10px;
}

.back-button:hover {
    background-color: #45a049;
}