diff --git a/src/padding/_drag_space.scss b/src/padding/_drag_space.scss
new file mode 100644
index 0000000..d9dc8df
--- /dev/null
+++ b/src/padding/_drag_space.scss
@@ -0,0 +1,12 @@
+/* for Extra Drag Space */
+:root {
+  --space-above-tabbar: 8px; /* If the option is not specified, it is equivalent to 0px. */
+}
+
+:root[tabsintitlebar][sizemode="normal"] #toolbar-menubar[autohide="true"] {
+  height: calc(var(--tab-min-height) + var(--space-above-tabbar));
+}
+:root[sizemode="normal"][chromehidden~="menubar"] #TabsToolbar > .toolbar-items,
+:root[sizemode="normal"] #toolbar-menubar[autohide="true"][inactive] + #TabsToolbar > .toolbar-items {
+  padding-top: var(--space-above-tabbar) !important;
+}
diff --git a/src/padding/_first_tab.scss b/src/padding/_first_tab.scss
new file mode 100644
index 0000000..64c3033
--- /dev/null
+++ b/src/padding/_first_tab.scss
@@ -0,0 +1,9 @@
+/* for First Tab Space */
+:root {
+  --space-left-tabbar: 8px; /* If the option is not specified, it is equivalent to 0px. */
+}
+
+:root:not([tabsintitlebar]) #tabbrowser-tabs:not([positionpinnedtabs]),
+:root:is([sizemode="maximized"], [sizemode="fullscreen"]) #tabbrowser-tabs:not([positionpinnedtabs]) {
+  padding-inline-start: var(--space-left-tabbar) !important;
+}
diff --git a/src/padding/_panel.scss b/src/padding/_panel.scss
new file mode 100644
index 0000000..7569e9f
--- /dev/null
+++ b/src/padding/_panel.scss
@@ -0,0 +1,13 @@
+:root {
+  --arrowpanel-menuicon-padding: 8px;
+  --arrowpanel-menuitem-margin: 0 var(--arrowpanel-menuicon-padding) !important; /* Original: 0 8px */
+  --arrowpanel-menuitem-padding: 5px !important; /* Original: 8px */
+  --arrowpanel-padding: 0.8em !important; /* Original: 16px or .cui-widget-panel, .cui-widget-panel::part(arrowcontent) => 4px 0 */
+}
+
+:root[uidensity="compact"] {
+  --arrowpanel-menuitem-padding: 3px !important; /* Original: 8px */
+}
+:root[uidensity="touch"] {
+  --arrowpanel-menuitem-padding: 8px !important; /* Original: 8px */
+}
diff --git a/src/padding/_toolbar_button.scss b/src/padding/_toolbar_button.scss
new file mode 100644
index 0000000..928fb05
--- /dev/null
+++ b/src/padding/_toolbar_button.scss
@@ -0,0 +1,3 @@
+:root[uidensity="compact"] {
+  --toolbarbutton-outer-padding: 2px !important; /* Original: 3px, General is 2px */
+}