Thank you! The page uses the same colors as the palette included with the Playscii files, in the file `dungeon-pal.png`.
Here's the full palette and a .GPL export:
---
GIMP Palette
Channels: RGBA
#
0 0 0 255 Untitled
0 43 36 255 Untitled
24 30 42 255 Untitled
84 106 0 255 Untitled
25 17 74 255 Untitled
47 42 76 255 Untitled
68 63 65 255 Untitled
8 66 72 255 Untitled
40 84 72 255 Untitled
82 82 76 255 Untitled
115 97 80 255 Untitled
119 120 91 255 Untitled
94 82 107 255 Untitled
130 91 49 255 Untitled
181 59 89 255 Untitled
255 87 119 255 Untitled
255 185 21 255 Untitled
255 224 119 255 Untitled
67 62 166 255 Untitled
71 114 191 255 Untitled
150 102 238 255 Untitled
87 176 103 255 Untitled
153 215 229 255 Untitled
255 249 228 255 Untitled