A better style for the Ubuntu Software Center (/usr/share/software-center/ui/gtk3/css/softwarecenter.css)

softwarecenter.css

@define-color light-aubergine #BBBBBB;
@define-color super-light-aubergine #EDEDED;

/* 
   do not use text-shadow until bugzilla.gnome.org bug #686209 is 
   fixed - its leaking memory
*/


#featured-star {
    border-color: #F89516;  /* yellow */
    color: #FFC51D;         /* orange */
}

.grid-lines {
    border-color: shade (@light-aubergine, 1.025);
}

#screenshot-preview {
    border-color: #000;
    color: #000;
    border-width: 2px;
    border-radius: 3px;
}

.backforward-left-button {
    border-radius: 3px 0 0 3px;
}

.backforward-right-button {
    border-radius: 0 3px 3px 0;
}

.subtle,
#subtle-label {
    -GtkWidget-link-color: shade (@super-light-aubergine, 0.5);
    -GtkWidget-visited-link-color: shade (@super-light-aubergine, 0.6);
    color: shade (@super-light-aubergine, 0.5); /* non-link text color */
}

.cellrenderer-button {
    border-radius: 3px;
}

.cellrenderer-avgrating-label {
    color: #8E8E8E; /* dark gray */
}

.cellrenderer-avgrating-label:selected {
    /*color: white;*/
    color: #8E8E8E; /* dark gray */
}

.more-link {
    -GtkButton-inner-border: 0;
    -GtkButton-default-border: 0;
    -GtkButton-default-outside-border: 0;
    color: darker (@light-aubergine);
    background-color: shade (@super-light-aubergine, 0.925);
    border-color: shade (@super-light-aubergine, 0.875);
}

.frame-header-title {
    /* intentionally left blank */
}

.item-view-separator {
    border-color: shade (@light-aubergine, 0.9);
    border-width: 1px;
}

.light-aubergine-bg {
    background-color: @light-aubergine;
    color: #AAFFAA;
}

.super-light-aubergine-bg {
    background-color: @super-light-aubergine;
    border-color: shade (@super-light-aubergine, 0.975);
    color: #AAAAFF;
}

GtkViewport {
    background-color: @super-light-aubergine;
    border-width: 0;
    padding: 0;
}

GtkTreeView {
    background-color: @super-light-aubergine;
    color: black;
}

GtkTreeView:selected {
    background-color: mix (@super-light-aubergine, #0000FF, 0.05);
    color: black;
}

#toolbar-popup {
    padding: 0;
}

/*
  GtkHBox, GtkLabel
  ActionBar
*/
.action-bar {
    background-color: @super-light-aubergine;
    border: 2px solid darker(@super-light-aubergine);
}