body {
  font-family: sans-serif;
  color: #444;
}

header .title,
header .subtitle {
  display: block;
  width: 100%;
  height: auto;
  max-width: 400px;
  margin: 0 auto;
}

header .subtitle {
  max-width: 200px;
}

main {
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  max-width: 800px;
  margin: 0 auto;
}

section {
  text-align: center;
}

h3 {
  margin-top: 40px;
}

img.mario {
  display: none;
  max-width: 300px;
  margin: 0 0 60px 0;
}

@media (min-width: 768px) {
  img.mario {
    display: block;
  }
}

.grid {
  display: flex;
  flex-wrap: wrap;
  width: 80%;
  padding: 4px;
  margin: 0 auto;
  background: lightgray;
  border-radius: 10px;
}

.grid img {
  max-width: 200px;
  width: calc(25% - 8px);
  height: auto;
  margin: 4px;
}