html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

body {
	background: #f0f0f0;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
  margin: 2em auto;
  max-width: 45em;
  border: 1px solid #aaa;
  padding: 1em;
}

.viewport {
  position: absolute;
  font-size: 75%;
  padding: 5px;
  color: grey;
  background: white;
  top: 0;
  left: calc(50% - 70px);
  border-radius: 11px;
  box-shadow: 1px 1px 5px 0px rgba(0,0,0,0.25);
}

table {
  border-collapse: collapse;
  width: 100%;
}
td {
  border: 1px solid grey;
  padding: 0.5em;
}

@media screen and (max-width: 35em) {
  tr,
  td {
    display: block;
    width: 100%;
  }
}