body {
  font-family: sans-serif;
  margin: 0;
}

nav a {
  color: white;
  text-decoration: underline;
  margin-right: 1em;
}
nav a:hover {
  text-decoration: none;
}

h1 {
  color: white;
  text-shadow: 0.1em 0.1em 0.1em black;
}

h2 {
  margin: 0 0 1em 0;
}

header {
  background-color: rgb(31, 142, 170);
  padding: 1em;
  text-align: center;
}

main > div {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.box {
  margin: 1em;
  padding: 1em;
  flex-basis: 20em;
  border: 1px solid gray;
  border-radius: 0.3em;
}

@media only screen and (max-width: 50em) {
  main > div {
    flex-wrap: wrap;
  }
  .box {
    flex-basis: 100%;
  }
}

button {
  margin: 0.5em;
}

label {
  display: block;
  margin-bottom: 0.5em;
}