Using brands on cards and/or buttons

[pipaber]

For shiny Python apps, if I want to set different 3 colours for 3 cards. This is easy to do with a _brand.yml file?

[gadenbuie]

Sort of? For example, if you set theme colors in color, then those values are used automatically by Shiny.

For example, if you've set color.primary, color.secondary and color.info,

color:
  palette:
    cyan: "#17A2B8"
    purple: "#6F42C1"
    white: "#F8F8F8"
  primary: purple
  secondary: black
  info: cyan

then you can use those values for value box themes

ui.layout_columns(
    ui.value_box("Metric 1", "100", theme="primary"),
    ui.value_box("Metric 2", "200", theme="secondary"),
    ui.value_box("Metric 3", "300", theme="info"),
),

and you could also apply the classes text-bg-primary, text-bg-secondary, text-bg-info to a card – with ui.card(..., class_="text-bg-primary") to get themed cards.

[pipaber]

Oh I understand! Many thanks!. Also, I was using something like this in a .css file:

.card-header {
   background: linear-gradient(15deg,#f37921, #e27256ea); 
   color: black;
   padding: 10px; 
}

.card {
   background-color: rgba(255, 255, 255, 0.9);
}

It's possible to set a color gradient or use rgba colors from a _brand-yml file?

[gadenbuie]

brand.yml will be somewhat orthogonal to this kind of CSS. In other words, the goal of the brand yml data is to set up a good baseline of defaults. There is a place where you can store extra CSS rules just for Shiny though:

defaults:
  shiny:
    theme:
      rules: |
        .card-header {
           background: linear-gradient(15deg,#f37921, #e27256ea); 
           color: black;
           padding: 10px; 
        }
        
        .card {
           background-color: rgba(255, 255, 255, 0.9);
        }