body {
  font-size: 20px;
  background-color: green;
  color: black;
  font-family: Verdana;
  }

@media screen and (width >= 80rem) {
  .container {
    margin: 1em 2em;
  }
}
.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
img {
  max-width: 100%;
  height: auto;
}