.columbos { 
    display: grid; 
    grid-template-columns: repeat(3, 1fr);
gap: 11px;
}

.card {
    border: 3px solid #420;
    padding: 12px;
    border-radius: 6px;
}

@media (max-width: 800px) {
    .columbos {
        grid-template-columns: 1fr;
    }
}

body {
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
  margin: 0;
  padding: 0;
}

header {
    border-bottom: 1px solid #696969;
    padding: 12px 16px;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 12px;
}

nav a {
  text-decoration: none;
  color: #111;
}

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

main {
  padding: 16px;
}

section {
  margin-bottom: 32px;
}