body {
  background-color: black;
  color: white;
  max-width: 600px;
  margin: 0 auto;
  padding: 0 20px 20px 20px;
  border: 5px solid black;
}

@media screen and (prefers-color-scheme: light) {
  body {
    background-color: white;
    color: black;
  }
}

html {
  font-size: 12px;
  font-family: "Open Sans", sans-serif;
  background-color: #151515;
}

h1,h2,h3 {
  margin: 0;
  padding: 20px 0;
  color: #00539f;
  font-size: 50px;
  text-align: center;
}

h2 {
  font-size: 40px;
}

h3 {
    font-size: 30px;
    text-align: left;
}

h4 {
    font-size: 25px;
    text-align: center;
}

p,
li {
  font-size: 16px;
  line-height: 2;
  letter-spacing: 1px;
}

p {
    text-align: center;
}

/* Center horizontally and cap height at 200px without upscaling */
#when_we_sleep_cover {
  display: block;          /* lets margins work on <img> */
  margin-inline: auto;     /* centers in LTR/RTL */
  max-height: 300px;       /* limit height */
  width: auto;             /* keep aspect ratio */
  height: auto;            /* prevent distortion */
  max-width: 100%;         /* don’t overflow narrow containers */
}

a:link {
  color: #cd642f;
  text-decoration: none;
}

a:visited {
  color: #f37637;
  text-decoration: none;
}

a:hover {
    color: #ff9639;
    text-decoration: none;
}

a:active {
    color: #9a4b23;
    text-decoration: none;
}