The graph has low accessibility (dark blue dots on a black background)

[tedsecretsource]

Describe the bug
The contrast ratio of the graph is somewhat low contributing to low accessibility.

To Reproduce
Steps to reproduce the behavior:

1. Upload a file
2. Enter search terms and press Enter
3. The graph displays on a black background with dark blue dots representing the vectors

Expected behavior
The contrast ratio between the dark blue dots and the background is great enough to more easily see the distribution.

[gabrielchua]

good point!

Two ways:

1. only have a “light” mode (there’s both in streamlit)
2. change the colours

Let me try 2)

[tedsecretsource]

I would definitely go with 2. I've never used streamlit so can't comment more than that. Thanks!

[gabrielchua]

Changed the colors in #11

Hope they're better/more accessible!