body {
  margin: 0;
  font-family: Arial, sans-serif;
}
header {
  background-color: #f1f1f1;
  padding: 10px;
  text-align: left;
  line-height: 20px;
  ;
}
.main-container {
  display: flex;
}
.sidebar {
  background-color: #003399;
  width: 200px;
  height: 100vh;
  color: white;
  padding-top: 20px;
}
.sidebar div {
  padding: 10px 15px;
  cursor: pointer;
}
.sidebar div:hover, .sidebar .active {
  background-color: white;
  color: black;
  border-radius: 0 10px 10px 0;
}
.content {
  flex: 1;
  padding: 40px;
}
.content-box {
  height: auto;
  padding: 20px;
  border-radius: 20px;
  background-color: #f1f1f1;
  text-align: center;
  line-height: 25px;
}