* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  color: #333;
  line-height: 1.5;
}

main {
  max-width: 700px;
  margin: 0 auto;
  padding: 20px;
  text-align: center;
}

.main-header {
  padding: 15px 0;
}

.main-header-nav {
  max-width: 900px;
  margin: 0 auto;

  display: flex;
  align-items: center;
  justify-content: space-between;
}

.main-header-nav img {
  border-radius: 50%;
}

.main-header-nav ul {
  list-style: none;
  display: flex;
  gap: 15px;
}

.main-header-nav a {
  text-decoration: none;
  color: #333;
  font-size: 14px;
}

.main-header-nav a:hover {
  color: #2a6fdb;
}

h1,
h2 {
  color: #2a6fdb;
}

h1 {
  margin-bottom: 10px;
}

h2 {
  margin: 20px 0 10px;
}

section {
  margin-bottom: 20px;
}

ul {
  list-style: none;
}

li {
  margin-bottom: 5px;
}

.code-example {
  background: #eaeaea;
  padding: 15px;
  border-radius: 5px;
}

pre {
  background: #dcdcdc;
  padding: 10px;
  border-radius: 4px;
  overflow-x: auto;
  text-align: left;
}

code {
  font-family: monospace;
  font-size: 14px;
  color: #222;
}

.main-footer {
  margin-top: 30px;
  padding: 15px 0;

  display: flex;
  justify-content: center;
  align-items: center;
  gap: 30px;

  background: #f4f4f4;
}

.main-footer img {
  display: block;
  opacity: 0.8;
  transition: 0.2s;
}

.main-footer img:hover {
  opacity: 1;
  transform: scale(1.05);
}