* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 40px;
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  color: #222;
}

h1,
h2,
h3,
h4,
h5 {
  margin: 12px 0;
  padding: 12px 16px;
  border-radius: 8px;
  background: white;
  border-left: 6px solid #4f46e5;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

h1 {
  font-size: 36px;
  color: #1d4ed8;
}

h2 {
  font-size: 30px;
  color: #047857;
}

h3 {
  font-size: 24px;
  color: #b45309;
}

h4 {
  font-size: 20px;
  color: #be123c;
}

h5 {
  font-size: 16px;
  color: #6d28d9;
}

body::before {
  content: "CSS loaded";
  display: inline-block;
  margin-bottom: 24px;
  padding: 8px 12px;
  background: #111827;
  color: white;
  border-radius: 999px;
  font-size: 14px;
  font-weight: bold;
}