底 is a Japanese kanji written with 8 strokes, listed here under the keyword “bottom”. It is built from 广 (cave) and 氐 (calling card). In Remembering the Kanji by James W. Heisig it is frame 1975.
On KumiJi Glyph Explorer, open the parts search and type “cave” + “calling card”. 底 is among the results, together with every other character containing the same shapes.
Open 底 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.