body {
  font-family: sans-serif;
  margin: 0;
}
header {
  background: rgb(68, 161, 254);
  height: 100px;
}
h1 {
  text-align: center;
  color: white;
  line-height: 100px;
  margin: 0;
}
section {
  zoom: 0.8;
  display: flex;
  flex-flow: row wrap;
}

article {
  padding: 10px;
  margin: 10px;
  background: rgb(161, 254, 68);
  min-width: 400px;
}
/* Add your flexbox CSS below here */