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              html {
  background: lightgrey;
  height: 100%;
  overflow: hidden;
body {
  height: 100%;
  background: whitesmoke;
  overflow: scroll;
  width: 80%;
  max-width: 600px;
  margin: 0 auto;
  padding: 3em;
  font: 100%/1.4 serif;
  border: 1px solid rgba(0,0,0,0.25)
p {
  margin: 0 0 1.5em;

body::-webkit-scrollbar {
    width: 0.2em;
body::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
body::-webkit-scrollbar-thumb {
  background-color: red;
  outline: 1px solid red;