.bottom[] doesn't work inside of .column[ .content[ ] ]

[albert-ying]

Hi, I was trying to put my 3 figures in 3 columns. However, I still want an overall title at the top of the slide.

So I tried to align the figures to bottom at each column by doing.

class: split-three

# Overall title

.column[
.content[
.bottom[
![:scale 100%](fig/n_cell_t1.png)
]
]
]

However, the .bottom[] doesn't seems to do anything.
My current work-around is to add <br> above the figures. It works fine, but I'm still wondering why .bottom[] is not working here?

class: split-three

# Overall title

.column[
.content[
<br> <br> <br> <br> <br> <br> <br> <br>
![:scale 100%](fig/n_cell_t1.png)
]
]
.column[
.content[
<br> <br> <br> <br> <br> <br> <br> <br>
![:scale 100%](fig/n_cell_t2.png)
]
]
.column[
.content[
<br> <br> <br> <br> <br> <br> <br> <br>
![:scale 100%](fig/n_cell_t3.png)
]
]

[albert-ying]

Also, I didn't get what .content is doing here? It seems to work the same with and without .content to me 👀