body {
  background-color: #ddd;
  font-size: 20px;
}
#content {
  max-width: 60%;
  margin: 40px auto;
  border: 1px solid darkgrey;
  padding: 50px;
}
p {
  color: #035f9c;
  font-size: 1.3em;
}
hr {
  height: 3px;
  background-color: #035f9c;
  margin: 30px auto;
  width: 80%;
}
h1,
h2,
p {
  text-align: center;
}
img {
  display: block;
  margin: 0 auto;
  width: 50%;
}
#topics {
  width: 55%;
  margin: 0 auto;
  line-height: 1.5em;
}
.list {
  list-style-type: none;
}

.background {
    background-color: black;
    color: white;
}