body {
  font-family: Arial, sans-serif;
  background: #f5f6f8;
  margin: 0;
  padding: 30px;
}

nav {
  margin-bottom: 30px;
}

nav a {
  margin-right: 20px;
  text-decoration: none;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

th,
td {
  padding: 14px;
  border-bottom: 1px solid #ddd;
  text-align: left;
}

th {
  background: #f0f0f0;
}

button {
  padding: 10px 18px;
  cursor: pointer;
}

input,
select {
  padding: 10px;
}

.login-box {
  max-width: 400px;
  margin: 100px auto;
  background: #fff;
  padding: 30px;
}

.login-box input {
  width: 100%;
  box-sizing: border-box;
  margin-bottom: 15px;
}