@import url("https://fonts.googleapis.com/css?family=Roboto");

body {
  font-family: "Roboto", sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f5f5;
}

.content-nav,
main.content {
  box-sizing: border-box;
}

.content-wrapper {
  display: flex;
  margin: 20px;
}

.content-nav {
  width: 220px;
  background-color: #e0e0e0;
  padding: 15px;
  border: 1px solid #bbbbbb;
}

.content-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.content-nav ul li {
  margin-bottom: 10px;
}

.content-nav ul li a {
  text-decoration: none;
  color: #222222;
  display: block;
  padding: 8px;
  transition: background-color 0.3s;
}

.content-nav ul li a:hover {
  background-color: #c8c8c8;
  border-radius: 4px;
}

main.content {
  flex: 1;
  background-color: #ffffff;
  padding: 20px;
  margin-left: 20px;
  border: 1px solid #bbbbbb;
}

main.content h2 {
  font-size: 2em;
  margin-top: 0;
}

main.content h3 {
  font-size: 1.5em;
  margin-top: 0;
}

main.content p {
  font-size: 1em;
  line-height: 1.6;
}

footer {
  background-color: #004225;
  color: #ffffff;
  text-align: center;
  padding: 10px 0;
  margin-top: 20px;
}

@media (max-width: 768px) {
  .content-wrapper {
    display: flex;
    flex-direction: column;
  }

  .content-nav {
    width: 100%;
    margin: 0;
    margin-bottom: 15px;
    padding: 0;
  }

  .content-nav ul {
    padding: 15px;
  }

  .content-nav ul li:last-child {
    margin-bottom: 0;
  }

  main.content {
    margin: 0;
    margin-left: 0;
    padding: 15px;
  }
}