How to change the color of my hover effect

[PAUL8]

Hello, 
I have a hover effect on my store that shows which sizes are available. Can you help me change the black color to white with a little bit of black surrounding it? 
I use dawn theme. My store is womber.fr and the password is PROPAGANDAAA
Thanks,

[PaulNewton · Accepted solution]

@PAUL8 avoid spamming labels.

In a custom-css setting try something like the following:
https://help.shopify.com/en/manual/online-store/themes/theme-structure/extend/add-css 

.variant-list {
  background: black;
  padding: 4px;
}
.variant-item .status {
  color: white;
}

[PAUL8]

Hello, thanks because it's working, but can you help me to make that scale-up effect but only desktop? Thanks