gtk.css

@binding-set NoKeyboardNavigation {
    unbind "<shift>F10"
}

* {
    -gtk-key-bindings: NoKeyboardNavigation
}

decoration {
    margin: 0 0 4px 0;
    box-shadow: none;
    background-color: #4c5153;
}

headerbar {
    border-radius: 0;
    min-height: 16px;
    padding: 0 2px 0 2px;
}

headerbar entry,
headerbar spinbutton,
headerbar button,
headerbar separator {
    margin: 2px 0 2px 0;
}

headerbar.default-decoration {
    min-height: 0;
}

headerbar .title,
titlebar .title {
    font-size: 80%;
}

headerbar .subtitle {
    font-size: 65%;
}

levelbar {
    padding: 1px;
}

paned {
    min-height: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

button,
entry,
popover,
level-bar,
header-bar,
titlebar,
trough,
GtkSwitch.slider {
    border-radius: 0;
}

GtkSwitch {
    font: Verdana 8;
}