Add Light mode support

[RohitSurya2809]

Add Light mode support the light theme was not working

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #121212;
    --text-color: #ffffff;
  }
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #ffffff;
    --text-color: #000000;
  }
}