body {
  background-color: lightsteelblue;
}
h1 {
  color: navy;
  font-family: Helvetica;
  font-size: 300%;
}
h2 {
  color: navy;
  font-family: Helvetica;
  font-size: 200%;
}
h3 {
  color: navy;
  font-family: Helvetica;
  font-size: 150%;
}
p {
  color: #202020;
  font-family: Helvetica;
  font-size: 100%;
}

video {
  max-width: 100%;
  height: auto;
}

.row {
  display: flex;
}

.column {
  flex: 25%;
  padding: 5px;
  text-align: center;
}