header {
  background-color: rgb(7, 7, 7);height: 61px;display: flex;justify-content: center;align-items: center;position: fixed;top: 0;width: 100%;z-index: 60;
}
header > nav {
  display: flex;align-items: center;justify-content: space-around;width: 100%;max-width: 800px;
}
header > nav > a {
  background-color: #23654a;color: #fee615;text-transform: uppercase;font-weight: 600;font-size: 14px;padding: 8px;text-decoration: none;border-radius: 6px;cursor: pointer;
}
header > nav > a:nth-child(4) {
  background-color: #13a34a;
}
@media screen and (max-width: 500px) {
  header > nav > a {
    font-size: 12px;
  }
}