```css id="updated-css"
body{
    margin:0;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(to right, #e3f2fd, #f5f7fa);
}
.pdf-download {
    text-align: center;
    margin-top: 50px;
    margin-bottom: 40px;
}

.pdf-download h2 {
    font-size: 24px;
    color: #003366;
    margin-bottom: 15px;
}

.download-btn {
    background-color: #0055aa;
    color: white;
    padding: 12px 25px;
    text-decoration: none;
    font-size: 18px;
    border-radius: 8px;
    transition: 0.3s;
}

.download-btn:hover {
    background-color: #003d80;
}

/* CONTAINER */
.container{
    width:85%;
    margin:auto;
    background:#ffffff;
    padding:40px;
    margin-top:30px;
    margin-bottom:30px;
    border-radius:10px;
    box-shadow:0 8px 25px rgba(0,0,0,0.15);
}

/* HEADER */
.header{
    text-align:center;
    padding-bottom:20px;
    border-bottom:3px solid #0b3d91;
}

/* LOGO */
.logo{
    width:180px;
    margin-bottom:10px;
}

/* TITLES */
.header h1{
    color:#0b3d91;
    margin:5px 0;
}

.header h2{
    color:#444;
    margin-bottom:10px;
}

.subtitle{
    font-weight:500;
}

.theme{
    max-width:700px;
    margin:auto;
    font-size:15px;
    color:#333;
}

.collab{
    margin-top:10px;
    color:#555;
}

.date{
    margin-top:10px;
    font-size:16px;
}

/* DAY TITLE */
.day-title{
    margin-top:40px;
    color:#0b3d91;
    border-left:6px solid #0b3d91;
    padding-left:10px;
}

/* SCHEDULE */
.schedule{
    margin-top:20px;
}

/* ROW */
.row{
    display:flex;
    padding:10px;
    border-bottom:1px solid #eee;
    transition:0.3s;
}

.row:hover{
    background:#f1f7ff;
}

/* TIME */
.time{
    width:30%;
    font-weight:bold;
    color:#1a237e;
}

/* EVENT */
.event{
    width:70%;
}

/* HIGHLIGHT */
.highlight{
    background:#e3f2fd;
    border-left:5px solid #2196f3;
}

/* SUBTITLE */
h3{
    margin-top:20px;
    color:#333;
}
```