style.css

body {
  margin: 0;
  padding: 6ex 16vw;
  box-sizing: border-box;
  width: 100%;
  height: 100vh;
  font-family: sans-serif;
}
body * {
  margin: 0 auto;
}
video {
  display: block;
  max-width: 58vw;
}
h1, h3 {
  width: 58vw;
  margin: auto;
}
h3 { font-weight: 400; }

footer {
  text-align: center;
  padding: 10px;
}

.tiles {
  padding: 6ex 0;
  display: flex;
  flex-wrap: wrap;
  flex-direction: row;
  justify-content: center;
  position: relative;
}
.tile {
  margin: 1vw;
  cursor: pointer;
  overflow: hidden;
  min-width: 120px;
  min-height: 120px;
  width: 18vw;
  height: 18vw;
}

.tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 500ms ease;
}

.tile img:hover {
  transform: scale(1.1);
}

@media only screen and (max-width: 442px) {
  body {
    padding: 6ex 4vw;
  }
  h1, h3 {
    width: 100%;
  }

  .tile {
    margin: 5px;
    width: 100%;
    height: 100%;
  }
}