* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
   justify-content: center;
   flex-direction: column ;
   align-self:center;

}
.part{
    display: flex;
    justify-self:center;
    align-items: center;
}

h1 {
    color: #4A90E2;
}

.menu-container {
    width: 480px;
    max-width: 600px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.chapter {
    border-bottom: 1px solid #ddd;
}

.accordion {
    background-color: #4A90E2;
    color: white;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    text-align: left;
    border: none;
    outline: none;
    font-size: 18px;
    transition: background-color 0.2s;
}

.accordion:hover {
    background-color: #3A7FC2;
}

.panel {
    padding: 15px;
    background-color: #f9f9f9;
    display: none;
    /* flex-direction: column; */
    font-size: 16px;
    color: #555;
}

.download-btn {
    margin-top: 10px;
    text-decoration: none;
    background-color: #4CAF50;
    color: white;
    padding: 8px 12px;
    border-radius: 5px;
    transition: background-color 0.2s;
}

.download-btn:hover {
    background-color: #45a049;
}