change styles for the dropdown, make things work nicely on mobile

src/components/popover/popover.js

@@ -18,7 +18,9 @@ const Popover = {
     // Takes a x/y object and tells how many pixels to offset from
     // anchor point on either axis
     offset: Object,
-    // Additional styles you may want for the popover container
+    // Replaces the classes you may want for the popover container.
+    // Use 'popover-default' in addition to get the default popover
+    // styles with your custom class.
     popoverClass: String
   },
   data () {
@@ -106,7 +108,7 @@ const Popover = {
       // single translate or translate3d resulted in blurry text.
       this.styles = {
         opacity: 1,
-        transform: `translateX(${Math.floor(translateX)}px) translateY(${Math.floor(translateY)}px)`
+        transform: `translateX(${Math.round(translateX)}px) translateY(${Math.round(translateY)}px)`
       }
     },
     showPopover () {

src/components/popover/popover.vue

@@ -14,7 +14,7 @@
       ref="content"
       :style="styles"
       class="popover"
-      :class="popoverClass"
+      :class="popoverClass || 'popover-default'"
     >
       <slot
         name="content"
@@ -34,6 +34,9 @@
   z-index: 8;
   position: absolute;
   min-width: 0;
+}
+
+.popover-default {
   transition: opacity 0.3s;
 
   box-shadow: 1px 1px 4px rgba(0,0,0,.6);