body {
  margin: 0;
  font-family: sans-serif;
  background: #fff;
  color: #000;
}

.sidebar {
  position: fixed;
  top: 50%;
  left: 30px;
  transform: translateY(-50%);
  text-align: left;
}

.sidebar img {
  width: 140px;
  margin-bottom: 30px;
}

.sidebar a {
  display: block;
  color: blue;
  text-decoration: underline;
  margin: 12px 0;
  font-size: 18px;
}

.content {
  margin-left: 200px;
  padding: 80px 20px;
  text-align: center;
}

h1 {
  font-size: 48px;
  margin-bottom: 20px;
}

h2 {
  font-size: 32px;
  margin-bottom: 15px;
}

.background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('fox2e_logo_mono.png') center center no-repeat;
  background-size: cover;
  opacity: 0.03; /* 97%透明 */
  z-index: -1;
}


.sidebar {
  font-family: Arial, sans-serif;
  font-size: 18px;
  line-height: 1.6;
}