body {
  background-color: #0d1b2a;
  background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%2335668f' fill-opacity='0.5'%3E%3Crect x='0' y='0' width='2' height='40'/%3E%3Crect x='0' y='0' width='40' height='2'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 40px 40px;
  color: #e0e0e0;
  margin: 0;
  padding: 0;
}
header {
  text-align: center;
  padding: 2rem 1rem;
  background-color: #0d1b2a;
  color: #00b4fc;
}
header h1 {
  font-size: 2.5rem;
  color: #40cfff;
}
header h4 {
  color: #fca311;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
header h3 {
  color: #fca311;
  margin-top: 0.5rem;
}
.topics {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  padding: 2rem 1rem;
}
.column {
  flex: 1 1 200px;
  margin: 1rem;
}
.column h2 {
  color: #fca311;
  font-size: 1.2rem;
}
ul {
  list-style-type: disc;
  padding-left: 1.2rem;
}
.submission {
  background-color: #001d3d;
  text-align: center;
  padding: 2rem 1rem;
}
.submission h2 {
  color: #40cfff;
}
.submission span {
  color: #fca311;
}
.submission a {
  color: #fcca46;
  text-decoration: none;
  font-weight: bold;
}
footer {
  background-color: #0d1b2a;
  color: #40cfff;
  padding: 1.5rem 1rem;
  text-align: center;
  font-size: 0.9rem;
}