Re: GNOME: more compact, screen real estate, less padding
Instead of mucking around with gnome tweak tool, try the lxde window manager. May solve your issue a little faster. Lxde seems to fit more on the screen than gnome-shell, for me at least.
sudo apt-get install lxde
clear && echo paste url and press enter; read paste; (youtube-dl $paste) | zenity --progress --title="☠" --text "Downloading, please wait" --auto-close --pulsate && ans=$(zenity --file-selection); gnome-terminal -x mplayer "$ans"