fix: improve styling of 'clear_button' selectize plugin

Author: cpsievert

inst/www/shared/shiny.min.css

@@ -487,6 +487,17 @@ textarea.textarea-autoresize.form-control {
   display: none;
 }
 
+// Selectize's clear_button plugin default styling is lack luster
+.shiny-input-select > .clear {
+  font-size: 0 !important;
+  &::before {
+    content: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-x-square" viewBox="0 0 16 16"><path d="M14 1a1 1 0 0 1 1 1v12a1 1 0 0 1-1 1H2a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1zM2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2z" /><path d="M4.646 4.646a.5.5 0 0 1 .708 0L8 7.293l2.646-2.647a.5.5 0 0 1 .708.708L8.707 8l2.647 2.646a.5.5 0 0 1-.708.708L8 8.707l-2.646 2.647a.5.5 0 0 1-.708-.708L7.293 8 4.646 5.354a.5.5 0 0 1 0-.708" /></svg>');
+  }
+  &:hover::before {
+    content: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-x-square-fill" viewBox="0 0 16 16"><path d="M2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2zm3.354 4.646L8 7.293l2.646-2.647a.5.5 0 0 1 .708.708L8.707 8l2.647 2.646a.5.5 0 0 1-.708.708L8 8.707l-2.646 2.647a.5.5 0 0 1-.708-.708L7.293 8 4.646 5.354a.5.5 0 1 1 .708-.708" /></svg>');
+  }
+}
+
 /* Hidden tabPanels */
 .nav-hidden {
   /* override anything bootstrap sets for `.nav` */