body {
  font-family: sans-serif;
  background: #f5f5f5;
  padding: 20px;
  color: #333;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

input[type="file"] {
  display: block;
  margin: 0 auto 20px auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  background: white;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

th, td {
  border: 1px solid #ccc;
  padding: 8px;
  text-align: left;
}

th {
  background-color: #eee;
  user-select: none;
}

th:hover {
  background-color: #ddd;
}