/* 18px body font */
html {
  font-size: 125%;
}

body {
  margin: 1rem;
  font-family: system-ui, Helvetica, Verdana, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  color: #333;
  background-color: #fff;
}

.container {
  max-width: 800px;
  margin: 0 auto;
}

.responsive-image {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.danger {
  color: red;
  font-weight: bold;
}