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I want to change the color orange to something else of Close button in Yaru theme.
How can it be done by editing the css file?

1

Workaround

OS: Ubuntu 19.10
GTK-Theme: Yaru
Icon-Theme: Yaru

open the file gtk.css from /usr/share/themes/Yaru/gtk-3.20/ with below command

sudo -H gedit /usr/share/themes/Yaru/gtk-3.20/gtk.css

paste the below code under the existing text and change the colors as per your wish.

  headerbar button.titlebutton:not(.appmenu).close,
  .titlebar button.titlebutton:not(.appmenu).close,
  headerbar.selection-mode button.titlebutton:not(.appmenu).close, button.titlebutton:not(.appmenu).close {
    color: #ffffff;
    background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(#E95420), to(transparent)); }
    headerbar button.titlebutton:not(.appmenu).close:hover,
    .titlebar button.titlebutton:not(.appmenu).close:hover,
    headerbar.selection-mode button.titlebutton:not(.appmenu).close:hover, button.titlebutton:not(.appmenu).close:hover {
      background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(#E95420), to(transparent));
      background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(#eb6637), to(transparent)); }
    headerbar button.titlebutton:not(.appmenu).close:active,
    .titlebar button.titlebutton:not(.appmenu).close:active,
    headerbar.selection-mode button.titlebutton:not(.appmenu).close:active, button.titlebutton:not(.appmenu).close:active {
      background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(#E95420), to(transparent));
      background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(#da4816), to(transparent)); }
    headerbar button.titlebutton:not(.appmenu).close:backdrop,
    .titlebar button.titlebutton:not(.appmenu).close:backdrop,
    headerbar.selection-mode button.titlebutton:not(.appmenu).close:backdrop, button.titlebutton:not(.appmenu).close:backdrop {
      background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(#636363), to(transparent)); }
      headerbar button.titlebutton:not(.appmenu).close:backdrop:hover,
      .titlebar button.titlebutton:not(.appmenu).close:backdrop:hover,
      headerbar.selection-mode button.titlebutton:not(.appmenu).close:backdrop:hover, button.titlebutton:not(.appmenu).close:backdrop:hover {
        background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(#707070), to(transparent)); }

Here is my Customized file content of the file /usr/share/themes/Yaru/gtk-3.20/gtk.css

@import url("resource:///com/ubuntu/themes/Yaru/3.20/gtk.css");

      headerbar button.titlebutton:not(.appmenu).close,
      .titlebar button.titlebutton:not(.appmenu).close,
      headerbar.selection-mode button.titlebutton:not(.appmenu).close, button.titlebutton:not(.appmenu).close {
        color: red;
        background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(green), to(transparent)); }
        headerbar button.titlebutton:not(.appmenu).close:hover,
        .titlebar button.titlebutton:not(.appmenu).close:hover,
        headerbar.selection-mode button.titlebutton:not(.appmenu).close:hover, button.titlebutton:not(.appmenu).close:hover {
          background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(gold), to(transparent));
          background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(cyan, to(transparent)); }
        headerbar button.titlebutton:not(.appmenu).close:active,
        .titlebar button.titlebutton:not(.appmenu).close:active,
        headerbar.selection-mode button.titlebutton:not(.appmenu).close:active, button.titlebutton:not(.appmenu).close:active {
          background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(magenta), to(transparent));
          background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(orange), to(transparent)); }
        headerbar button.titlebutton:not(.appmenu).close:backdrop,
        .titlebar button.titlebutton:not(.appmenu).close:backdrop,
        headerbar.selection-mode button.titlebutton:not(.appmenu).close:backdrop, button.titlebutton:not(.appmenu).close:backdrop {
          background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(blue), to(transparent)); }
          headerbar button.titlebutton:not(.appmenu).close:backdrop:hover,
          .titlebar button.titlebutton:not(.appmenu).close:backdrop:hover,
          headerbar.selection-mode button.titlebutton:not(.appmenu).close:backdrop:hover, button.titlebutton:not(.appmenu).close:backdrop:hover {
            background-image: -gtk-gradient(radial, center center, 0, center center, 0.35714, to(yellow), to(transparent)); }

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Optionally you can change the icon. Below pic is a self explanatory..

enter image description here

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