* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: "Times New Roman", Times, serif;
  background-color: #002448;
  color: #2bdbd2;
}
.topnav {
  background-color: #0f2f33;
  text-align: center;
  padding: 10px;
}
.topnav a {
  color: #5CBF5C;
  text-decoration: none;
  padding: 8px 15px;
  display: inline-block;
}
.topnav a:hover {
  color: #e9467c;
}
.content {
  width: 90%;
  max-width: 900px;
  margin: 25px auto;
  padding: 20px;
  border: 2px solid #5CBF5C;
  background-color: #0f2f33;
}
h2 {
  color: #cedf3a;
}
.center-text {
  text-align: center;
}
img, video {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 15px auto;
}
footer {
  text-align: center;
  padding: 15px;
  background-color: #0f2f33;
  color: #7adf7a;
}