:root {
  --body-bg-color: #ededed;
  --text-color: #333;
}

html {
  font-size: 10px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
    "Helvetica Neue", Arial, sans-serif;
  font-size: 1.6rem;
  line-height: 1.5;
  text-align: center;
  color: var(--text-color);
  margin: 0;
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  background-color: var(--body-bg-color);
  width: 100%;
  z-index: 5;
  height: 50px;
}

nav ul {
  display: flex;
  justify-content: center;
}

nav ul li {
  margin: 0 20px;
  display: inline-block;
  line-height: 50px;
}

nav ul li a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: bold;
  margin: auto;
}

nav ul li a:hover {
  text-decoration: underline;
}

h1 {
  font-size: 3rem;
  margin-bottom: 0;
}

@media (max-width: 460px) {
  h1 {
    font-size: 3.5rem;
    line-height: 1.2;
  }
}

h2 {
  font-size: 3.25rem;
}

a {
  color: #477ca7;
}

a:visited {
  color: #74638f;
}

#main {
  margin: 50px 8px 0px 8px;
  padding: 15px;
  border-radius: 5px;
  background: var(--body-bg-color);
  position: relative;
}

@media (max-width: 460px) {
  #main {
    margin: 0;
  }
}

img {
  max-width: 80%;
  display: block;
  height: auto;
  margin: 0 auto;
}

#img-div {
  background: var(--body-bg-color);
  padding: 10px;
  margin: 0;
}

#img-caption {
  margin: 15px 0 5px 0;
}

@media (max-width: 460px) {
  #img-caption {
    font-size: 1.4rem;
  }
}

h3 {
  margin: 50px 0;
  text-align: center;
}

ul {
  max-width: 550px;
  margin: 0 auto 50px auto;
  text-align: left;
  line-height: 1.6;
}

li {
  margin: 16px 0;
}

footer {
  width: 100%;
  height: 40px;
}
footer h4 {
  line-height: 40px;
}