body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f0f2f5;   /* WIDOCZNE tło */
  color: #222;
}

header {

}

header .wrap {
  max-width: 900px;        /* IDENTYCZNE jak main */
  margin: 20px auto 0;     /* wyśrodkowanie */
  padding: 16px;
  background: #37a05f;     /* TŁO JEST TU */
  color: white;
  border-radius: 6px;
}


header a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

nav {
  margin-top: 8px;
}

nav a {
  color: #ffe6f2;
  margin-right: 12px;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 900px;
  margin: 30px auto;
  background: white;
  padding: 24px;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

img {
  max-width: 50%;
  display: block;
  margin: 20px auto 0;
}

footer {
  text-align: center;
  font-size: 14px;
  color: #666;
  padding: 20px;
}