nixos/options/custom/programs/walker/style.css

/***
/* !! Inherits system GTK theme
https://github.com/abenz1267/walker/blob/master/internal/config/themes/bare.css
https://docs.gtk.org/gtk4/css-properties.html
***/

/* Transparent background overlay */
#window {
  background: none;
}

/* Visible window overlay */
#box {
  background: #002b36;
  border: 2px #073642 solid;
  border-radius: 25px;
  font: larger sans-serif;
  padding: 4px;
}

/* Input box */
#search entry {
  border-radius: 25px;
  margin-bottom: 4px;
  padding: 4px;
}

/* Input box icons */
#search entry image {
  opacity: 0;
}

/* List */
#list {
  background: none;
}

/* List entry */
#list child {
  border-radius: 25px;
  margin: 2px 8px;
  padding: 8px;
}

/* List entry icon */
#list child #icon {
  margin-right: 8px;
}

/* List entry subtext */
#list child #sub {
  font-size: x-small;
  opacity: 0.5;
}