body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

/* Header */
header {
  background-color: #333;
  color: #fff;
  height: 80px;
  display: flex;
  align-items: center;
  padding: 0 20px;
}

header h1 {
  margin: 0;
  font-size: 30px;
}

/* Navigation bar */
nav {
  background-color: #333;
  color: #fff;
  height: 100%;
  position: fixed;
  left: 0;
  top: 80px;
  width: 200px;
  display: flex;
  flex-direction: column;
}

nav h2 {
  margin: 20px 0;
  text-align: center;
}

nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
}

nav ul li {
  margin: 5px 0;
  position: relative;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  padding: 10px;
  display: block;
}

nav ul li:hover > ul {
  display: block;
}

nav ul ul {
  display: none;
  position: absolute;
  top: 0;
  left: 200px;
  background-color: #333;
  padding: 0;
}

nav ul ul li {
  width: 200px;
  float: none;
  display: list-item;
  position: relative;
}

nav ul ul ul {
  display: none;
  position: absolute;
  top: 0;
  left: 200px;
  background-color: #333;
  padding: 0;
}

nav ul ul ul li {
  width: 200px;
  float: none;
  display: list-item;
  position: relative;
}

nav ul ul ul ul {
  display: none;
  position: absolute;
  top: 0;
  left: 200px;
  background-color: #333;
  padding: 0;
}

nav ul ul ul ul li {
  width: 200px;
  float: none;
  display: list-item;
  position: relative;
}

/* Main content */
main {
  margin-bottom: 100px;
  margin-left: 200px;
  padding: 20px;
}

/* Footer */
footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 20px;
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
}

.right {
  margin-left: 650px;
  color: white;
}

.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  margin-bottom: 5px;
}
.form-group input, .form-group select {
  display: block;
  width: 100%;
  height: 40px;
  padding: 10px;
  font-size: 16px;
  border-radius: 4px;
  border: 1px solid #ccc;
  background-color: #fff;
  box-shadow: inset 0 1px 1px rgba(0,0,0,0.075);
  transition: border-color ease-in-out 0.15s, box-shadow ease-in-out 0.15s;
}
.form-group input:focus, .form-group select:focus {
  border-color: #4d90fe
}
  table {
  border-collapse: collapse;
  width: 100%;
}

table th,
table td {
  padding: 8px;
  text-align: left;
  border: 1px solid #ddd;
}

table th {
  background-color: #f2f2f2;
  color: #333;
  font-weight: bold;
}

table tr:nth-child(even) {
  background-color: #f2f2f2;
}

table tr:hover {
  background-color: #ddd;
}