html {
  background-color: lightgray;
}

body {
  padding-top: 50px;
  padding-bottom: 50px;
  margin: 0 auto;
  width: 80vw;
  min-height: calc(100vh - 100px);
  text-align: center;
  background-color: white;
}

hr, section {
  width: 90%;
  margin: 0 auto;
}

footer {
  margin-top: 20px;
}

img {
  max-width: 90%;
}