html {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14pt;
  line-height: 1.3;
}

body {
  width: 800px;
  max-width: 90%;
  margin: 5rem auto;
}

article {
  margin: 5rem 0;
}

section {
  margin: 3rem 0;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: normal;
}

article > h1 {
  font-weight: bold;
}

samp {
  display: block;
  margin: 1em 0;
}

code, kbd {
  color: steelblue;
  font-style: normal;
  font-weight: normal;
}

code.tag::before {
  content: "<";
}

code.tag::after {
  content: ">";
}

ol.instructions {
  background-color: #f2f2f2;
  padding: 1rem 1rem 1rem 2rem;
  color: #666666;
  font-style: italic;
  font-size: 0.8rem;
  line-height: 1.2;
}

ol.instructions > li {
  margin: 0.4rem 0;
}

ol.instructions > li:first-child { margin-top: 0; }
ol.instructions > li:last-child { margin-bottom: 0; }

aside {
  padding: 1rem 2rem;
  color: white;
  background-color: gray;
  font-size: 0.8rem;
  margin: 1em 0;
}

.overflow-example {
  padding: 1rem;
  border: 1px solid gray;
}

.portrait {
  width: 125px;
}

.positioned-element {
  width: 50px;
  height: 50px;
  background-color: #ccc;
}

.static-example,
.relative-example,
.absolute-example,
.fixed-example,
.sticky-example {
  border: 1px solid #999;
  padding: 0 1rem;
}

.box-layers {
    background-color: #eeeeee;
    padding: 2rem 1rem 4rem 1rem;
    border-top: 10px solid #dddddd;
    margin: 4rem 0;
}

.h2-wrapper {
    border: 1px solid black;
}

.box-sizing-example {
  background-color: #eeeeee;
  padding: 2rem;
  border: 10px solid #dddddd;
  width: 100%;
  box-sizing: border-box;
}

.overflow-example {
    width: 50%;
    height: 300px;
    overflow: auto;
}