html, body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background-color: white;
  color: black;
  height: 100%;
  display: flex;
  flex-direction: column;
}

header, footer {
  background-color: black;
  color: white;
  text-align: center;
  padding: 20px;
  font-weight: bold;
}

.container {
  display: flex;
  flex: 1;
}

nav {
  width: 20%;
  background-color: black;
  color: black;
  padding: 20px;
  box-sizing: border-box;
}

nav a {
  display: block;
  color: white;
  text-decoration: none;
  margin: 15px 0;
  font-weight: bold;
}

nav a:hover {
  color: gold;
}

a {
  color: black;
  text-decoration: none;
}

    a:hover {
        text-decoration: underline;
        color: gold;
        text-decoration: none;
    }

main {
  width: 80%;
  padding: 20px;
  box-sizing: border-box;
  background-color: white;
}