minimal.css

body {
  margin: 0;
  font-family: Roboto, Arial, sans-serif;
  color: #3c4043;
  line-height: 1.25rem;
 
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New", monospace;
}

main {
  margin: 0 auto;
  max-width: 600px;
}

@media only screen and (max-width: 600px){
  main {
    margin-left: 10px;
    margin-right: 10px;
  }
}