.btn {
  display: inline-block;
  padding: 10px 24px;
  background-color: #ffffff;
  color: #000000;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s ease;
}
.btn:hover {
  background-color: #f2f2f2;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-1px);
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  min-height: 100vh;
  background: url("https://images.unsplash.com/photo-1500530855697-b586d89ba3ee")
  no-repeat center center fixed;
  background-size: cover;

  color: #ffffff;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.8;
}
.overlay {
  min-height: 100vh;
  background-color: rgba(0, 0, 0, 0.35);
  padding: 40px;
}
h1, h2, p, li, a {
  color: #ffffff;
}

a:hover {
  text-decoration: underline;
}