my gtk.css(~/.config/gtk-3.0/gtk.css) file for ubuntu GNOME

gtk.css

/* .header-bar.default-decoration {
  padding-top: 1px;
  padding-bottom: 1px;
  font-size: 0.3em !important;
}
.header-bar.default-decoration .button.titlebutton {
  padding: 0px;
}

window.ssd headerbar.titlebar {
  padding-top: 1px;
  padding-bottom: 1px;
  min-height: 0;
}
window.ssd headerbar.titlebar button.titlebutton {
  padding: 0px;
  min-height: 0;
  min-width: 0;
}

headerbar {
  min-height: 0px;
  padding-top: 1.2px;
  padding-bottom: 0.5px;
  padding-right: 2px;
  padding-left: 1px;
}

headerbar entry,
headerbar spinbutton,
headerbar button,
headerbar separator {
  margin-top: 0px;
  margin-bottom: 0px;
  margin-left: 2px;
} */

/*
window.ssd separator:first-child + headerbar:backdrop,
window.ssd separator:first-child + headerbar,
window.ssd headerbar:first-child:backdrop,
window.ssd headerbar:first-child,
window.ssd headerbar:last-child:backdrop,
window.ssd headerbar:last-child,
window.ssd stack headerbar:first-child:backdrop,
window.ssd stack headerbar:first-child,
window.ssd stack headerbar:last-child:backdrop,
window.ssd stack headerbar:last-child,
window.ssd decoration,
window.ssd headerbar.titlebar {
  border-radius: 0;
}

window.ssd headerbar * {
  margin-top: -100px;
  color: #1c2022; /~ May need to tweak, this matches Adwaita Dark ~/
}

window.ssd headerbar.titlebar,
window.ssd headerbar.titlebar button.titlebutton {
  border: none;
  font-size: 0;
  height: 0;
  margin: 0;
  max-height: 0;
  min-height: 0;
  padding: 0;
}
*/

/* terminal-window notebook {
  border-width: 0px 10px 10px 10px;
  border-style: solid;
  border-color: grey;
} */

/* terminal-window.maximized notebook,
  terminal-window.fullscreen notebook {
  border-style: none;
} */

.window-frame {
  overflow: hidden !important;
  background-clip: content-box;
  border-radius: 7px !important;
}

decoration {
  border-bottom-left-radius: 7px;
  border-bottom-right-radius: 7px;
  border: 1.2px solid #2E2E2E;
  box-shadow: 0 0 1px 1px black !important;
  background: #2E2E2E;
  background-clip: border-box;
  box-sizing: border-box;
  overflow: hidden !important;
  background: gray;
}

.GtkFrame {
  overflow: hidden;
}

.titlebar {
  min-height: 0px;
  padding: 0px 7px;
}

.titlebar .subtitle,
GtkCalendar.header .subtitle,
.header-bar .subtitle {
  font-size: 50%;
  padding: 0 12px;
}

 
/* shrink headebars */
headerbar {
  border: 1px solid #2E2E2E;
  border-top: 0.7px solid #757575;

}

/* headerbar entry,
headerbar spinbutton,
headerbar button,
headerbar separator {
  border: 1px solid #333333;

} */