body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
}

header {
  background-color: #007bff;
  color: white;
  padding: 10px 0;
  text-align: center;
  width: 100%;
}

aside {
  background-color: #f4f4f9;
  padding: 20px;
  width: 200px;
}

aside h2 {
  font-size: 1.2em;
}

aside ul {
  list-style-type: none;
  padding: 0;
}

aside ul li {
  margin: 10px 0;
}

aside ul li a {
  text-decoration: none;
  color: #007bff;
}

aside ul li a:hover {
  text-decoration: underline;
}

section {
  flex-grow: 1;
  padding: 20px;
}

canvas {
  border: 1px
}