body {
  background-color: #000;
  color: #fff;
  font-family: Arial, sans-serif;
}

a {
  color: #1e90ff;
}

th, td {
  border-color: #555;
}

/* Toggle switch style */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #666;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

.switch input:checked + .slider {
  background-color: #2196F3;
}

.switch input:checked + .slider:before {
  transform: translateX(26px);
}

.slider.round {
  border-radius: 24px;
}

.slider.round:before {
  border-radius: 50%;
}

.header {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  background-color: #222;
  padding: 0.5rem 1rem;
}

.header nav {
  margin-right: 1rem;
}

.header nav a {
  margin: 0 0.5rem;
}

.header .username {
  font-weight: bold;
}

.header .logout-button {
  margin-left: 0.5rem;
}