body {
  font-family: Arial;
  padding: 20px;
}

.nav button {
  margin: 5px;
}

.tab {
  margin-top: 20px;
}

body {
  font-family: Arial;
  padding: 20px;
  background: #f5f5f5;
}

input, select, button {
  margin: 5px;
  padding: 8px;
}

button {
  cursor: pointer;
}