gtk.css

/* smaller widgets */

button {
    min-height: 20px;
}
button:not(.text-button):not(.combo) {
    padding-left: 6px;
    padding-right: 6px;
}
button.image-button:not(.text-button) {
    padding-left: 2px;
    padding-right: 2px;
}
button.sidebar-button.image-button {
    min-width: 20px;
    min-height: 20px;
    padding: 0;
}
button.slider-button:not(.text-button) {
    padding-left: 0;
    padding-right: 0;
}
button.selection-menu {
    padding-top: 4px;
    padding-bottom: 4px;
}
.emoji-picker button.emoji-section {
    padding-left: 0;
    padding-right: 0;
}
entry, spinbutton {
    min-height: 28px;
}
stackswitcher > button.text-button:not(.circular) {
    min-width: 65px;
}
.stack-switcher > button > image {
    padding: 0 4px;
}
toolbar.inline-toolbar button.image-button {
    padding-top: 4px;
    padding-bottom: 4px;
}
treeview header button {
    min-height: 27px;
}

notebook tabs {
    padding: 0;
}
notebook tab {
    margin: 0;
    min-height: 25px;
}
notebook tab button.flat {
    margin-top: 1px;
    margin-bottom: 1px;
}
notebook > header > tabs > tab > box > button.flat:not(.text-button):not(.combo) {
    padding-left: 1px;
    padding-right: 1px;
}

toolbutton button {
    padding: 1px 5px;
}
toolbutton button.popup.toggle {
    padding-left: 3px;
    padding-right: 3px;
}
toolbutton button label {
    padding-left: 1px;
    padding-right: 0;
}

tooltip * {
    padding: 1px 2px;
}

popover.background {
    padding: 0;
}

placessidebar row {
    min-height: 30px;
}
placessidebar row revealer {
    padding-left: 12px;
    padding-right: 12px;
}

hdysqueezer hdyviewswitcher box {
    padding-top: 0;
    padding-bottom: 0;
}


/* smaller titlebars */

.titlebar, headerbar {
    min-height: 34px;
}
button.titlebutton {
    min-height: 28px;
    min-width: 16px;
    margin: 0;
    padding: 0;
}

headerbar switch {
    margin-top: 7px;
    margin-bottom: 7px;
}

.default-decoration {
    padding-top: 0;
    padding-bottom: 0;
}
.maximized .default-decoration,
.tiled .default-decoration {
    min-height: 28px;
}
.maximized .default-decoration .titlebutton,
.tiled .default-decoration .titlebutton {
    min-height: 22px;
}


/* better readability */

menu separator {
    margin-top: 4px;
    margin-bottom: 4px;
}
popover.background separator.horizontal {
    margin-top: 6px;
    margin-bottom: 6px;
}

treeview {
    padding: 2px;
    -GtkTreeView-horizontal-separator: 5;
}

.dim-label, .titlebar.subtitle {
    opacity: 0.8;
}

menu menuitem check:not(:checked),
menu menuitem radio:not(:checked) {
    border-color: alpha(currentColor, 0.3);
}

modelbutton.flat {
    border-radius: 2px;
}
modelbutton.flat:hover {
    color: @theme_selected_fg_color;
    background-color: @theme_selected_bg_color;
}

progressbar.horizontal trough,
progressbar.horizontal progress {
    min-height: 8px;
}
progressbar.vertical trough,
progressbar.vertical progress {
    min-width: 8px;
}
levelbar trough {
    min-height: 7px;
}


/* custom changes */

.titlebar .title {
    font-size: 1.04em;
}

filechooser #pathbarbox {
    background: none;
    border-bottom: 1px solid @unfocused_borders;
}

popover.background {
    border-radius: 5px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}
popover.menu {
    background: @content_view_bg;
}

toolbutton button {
    -gtk-icon-style: symbolic;
}

.titlebar > .right, .titlebar > headerbar > .right {
    margin-left: -6px;
}


/* dialogs */

* {
    -GtkDialog-action-area-border: 5;
}

messagedialog {
    -GtkDialog-action-area-border: 0;
    -GtkWidget-window-dragging: true;

}
messagedialog .dialog-action-area button {
    padding-top: 8px;
    padding-bottom: 8px;
}
messagedialog .titlebar .title {
    margin-top: 1px;
    opacity: 0.7;
}
messagedialog .titlebar {
    min-height: 0;
}
messagedialog .dialog-vbox {
    margin-top: 11px;
}


/* nautilus */

.nautilus-window button.disclosure-button {
    padding-left: 3px;
    padding-right: 3px;
}
.nautilus-window .nautilus-path-bar button:first-child image:first-child {
    margin-right: -6px;
    margin-left: 4px;
}


/* terminal */

terminal-window notebook button {
    min-height: 20px;
    min-width: 20px;
    padding: 0;
}