fix SSR regression (#2982)

packages/color-picker/src/components/alpha-slider.vue

@@ -17,9 +17,6 @@
   </div>
 </template>
 
-<style>
-</style>
-
 <script>
   import draggable from '../draggable';
 

packages/color-picker/src/components/hue-slider.vue

@@ -11,9 +11,6 @@
   </div>
 </template>
 
-<style>
-</style>
-
 <script>
   import draggable from '../draggable';
 

packages/color-picker/src/components/picker-dropdown.vue

@@ -16,8 +16,7 @@
     </div>
   </transition>
 </template>
-<style>
-</style>
+
 <script>
   import SvPanel from './sv-panel';
   import HueSlider from './hue-slider';

packages/color-picker/src/components/sv-panel.vue

@@ -15,9 +15,6 @@
   </div>
 </template>
 
-<style>
-</style>
-
 <script>
   import draggable from '../draggable';
 

packages/color-picker/src/main.vue

@@ -22,9 +22,6 @@
   </div>
 </template>
 
-<style>
-</style>
-
 <script>
   import Color from './color';
   import PickerDropdown from './components/picker-dropdown.vue';