* { zoom: 1; box-sizing: border-box; }
html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  font-size: 62.5%;
  overflow: hidden;
}
body {
  overflow: auto;
  font-size: 1.7rem;
  font-family: sans-serif;
}
img {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  margin: 0 auto;
  padding: 0;
}