如何在 Kali Linux 中去除圆角（kali-rolling）

Question

在 /usr/share/themes/my_custom_theme/gnome-shell/gnome-shell.css我有：

@import url("/usr/share/gnome-shell/theme/gnome-shell.css");

/* GLOBALS */

#panel .panel-corner,
#panel .panel-corner:focus,
#panel .panel-corner:active,
#panel .panel-corner:overview,
#panel .panel-corner.lock-screen,
#panel .panel-corner.login-screen,
#panel .panel-corner.unlock-screen {
    -panel-corner-border-width: 2px;
    -panel-corner-radius: 0px;
    -panel-corner-background-color: transparent;
    -panel-corner-border-width: 0px;
    -panel-corner-border-color: transparent; 
}

我正在尝试删除圆角，但这似乎对此没有任何影响。我缺少什么才能让它发挥作用。

谢谢大家。