* {
  margin: 5px;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: grey;
  color: rgb(0, 0, 0);
}

main article {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

main article img {
  width: 100%;
  height: auto;
}

h3 {
  font-family: Arial, Helvetica, sans-serif;
}

h1 {
  font-family: Arial, Helvetica, sans-serif;
}