body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 0;
  background: #f4f4f4;
}
nav {
  background: #333;
  color: #fff;
  padding: 1em;
}
main {
  max-width: 600px;
  margin: 2em auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  padding: 2em;
}
#upload {
  margin-bottom: 2em;
}
#filesList ul {
  list-style: none;
  padding: 0;
}
#filesList li {
  padding: 0.5em 0;
  border-bottom: 1px solid #eee;
}
#filesList li:last-child {
  border: none;
}
a {
  color: #007bff;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}