This is because the inline style display:block is overwriting your CSS. You'll need to either remove this inline style or use:

#tfl {
  display: none !important;
}

This overrides inline styles. Note that using !important is generally not recommended unless it's a last resort.

This is because the inline style display:block is overriding your CSS. You'll need to either remove this inline style or use:

#tfl {
  display: none !important;
}

This overrides inline styles. Note that using !important is generally not recommended unless it's a last resort.