html, body {
  margin: 0;
  background-color: #f8f8f8;
  height: 100%;
  font-family: Roboto, sans-serif;
  font-size: 14px;
}

h1 {
  margin: 0 0 15px 0;
  color: #444;
  font-size: 28px;
}

#wrapper {
  padding: 20px;
  display: inline-block;
}

table.data_table {
  margin: 0px;
  font-family: Arial, sans-serif;
  font-size: 14px;
  border-collapse: separate;
  border-spacing: 0;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  max-width: none;
  overflow-y: auto;
}

.data_table tr {
  background-color: white;
  cursor: pointer;
}

.data_table td {
  padding: 4px 10px;
  text-align: center;
  color: #333333;
  border-bottom: 1px solid #555;
  border-right: 1px solid #555;
  white-space: nowrap;
  height: 20px;
}

.data_table th {
  padding: 5px;
  position: sticky;
  top: 0;
  text-align: center;
  color: #333;
  background-color: #ccc;
  white-space: pre;
  border-bottom: 1px solid #555;
  border-right: 1px solid #555;
  border-top: 1px solid #555;
  z-index: 100;
}

.data_table th:first-child,
.data_table td:first-child {
  border-left: 1px solid #555;
}

.button {
  padding: 3px 8px;
  background-color: #7777cc;
  color: white;
  border: 1px solid #333;
  border-radius: 5px;
  text-decoration: none;
  cursor: pointer;
  display: inline-block;
}

.button:hover {
  background-color: #5555aa;
}

p {
  margin: 20px 0;
}