I'm attempting to install Gentoo through VirtualBox. Well, technically I've already installed it, but I still need a WM. While trying to emerge Xorg , I ran out of space, and so I resized the /dev/sda3 (main) partition by deleting it and creating a new one, but unfortunately, the /dev/root partition(?) doesn't resize with it, and I can't modify it with fdisk (can't open/detect it). I've read it's a symlink, so I guess it's not technically a partition? I don't know. I'm using Systemd rather than OpenRC if that matters (probably doesn't but I felt like I should mention it).
With df -h I'm getting
Filesystem Size Used Avail Use% Mounted on
/dev/root 3.7G 3.5 0 100% /
(Can't post whole thing since I don't have mouse support installed)