fix(dropdown): dark theme style

src/dropdown/src/DropdownMenu.js

@@ -32,13 +32,17 @@ export default {
   render () {
     const {
       NDropdown: {
-        size
+        size,
+        mergedTheme
       }
     } = this
     return h('div', {
       class: [
         'n-dropdown-menu',
-        `n-dropdown-menu--${size}-size`
+        `n-dropdown-menu--${size}-size`,
+        {
+          [`n-${mergedTheme}-theme`]: mergedTheme
+        }
       ]
     },
     [

src/dropdown/src/styles/themed-base.cssr.js

@@ -5,6 +5,7 @@ export default c([
   ({ props }) => {
     const local = props.$local
     const {
+      color,
       prefixColor,
       suffixColor,
       dividerColor,
@@ -16,7 +17,7 @@ export default c([
     return [
       cTB('dropdown-menu', {
         padding,
-        background: 'white',
+        backgroundColor: color,
         borderRadius,
         boxShadow
       }, [

src/dropdown/styles/dark.js

@@ -8,15 +8,17 @@ export default create({
     const {
       textColor2,
       popoverBoxShadow,
-      dividerColor,
-      hoverColorOverlay
+      dividerColorOverlay,
+      hoverColorOverlay,
+      popoverColor
     } = derived
     const {
       borderRadius
     } = base
     return {
       ...commonVariables,
-      dividerColor,
+      color: popoverColor,
+      dividerColor: dividerColorOverlay,
       borderRadius,
       boxShadow: popoverBoxShadow,
       suffixColor: textColor2,

src/dropdown/styles/light.js

@@ -9,13 +9,15 @@ export default create({
       textColor2,
       popoverBoxShadow,
       dividerColor,
-      hoverColorOverlay
+      hoverColorOverlay,
+      popoverColor
     } = derived
     const {
       borderRadius
     } = base
     return {
       ...commonVariables,
+      color: popoverColor,
       dividerColor,
       borderRadius,
       boxShadow: popoverBoxShadow,