Fix popover card arrow border

components/modal/style/modal.less

@@ -32,7 +32,7 @@
     border: 0;
     border-radius: @border-radius-base;
     background-clip: padding-box;
-    box-shadow: 0px 6px 8px 0px rgba(100, 100, 100, 0.4);
+    box-shadow: @shadow-2;
   }
 
   &-close {

components/popover/style/index.less

@@ -55,7 +55,6 @@
     min-width: @popover-min-width;
     background-color: @popover-bg;
     background-clip: padding-box;
-    border: 1px solid @popover-border-color;
     border-radius: @border-radius-base;
     box-shadow: @box-shadow-base;
   }
@@ -124,7 +123,7 @@
   &-placement-topRight &-arrow {
     border-bottom-width: 0;
     border-top-color: @popover-arrow-outer-color;
-    bottom: 0;
+    bottom: -1px;
     &:after {
       content: " ";
       bottom: 1px;
@@ -147,7 +146,7 @@
   &-placement-right &-arrow,
   &-placement-rightTop &-arrow,
   &-placement-rightBottom &-arrow {
-    left: 0;
+    left: -1px;
     border-left-width: 0;
     border-right-color: @popover-arrow-outer-color;
     &:after {
@@ -174,7 +173,7 @@
   &-placement-bottomRight &-arrow {
     border-top-width: 0;
     border-bottom-color: @popover-arrow-outer-color;
-    top: 0;
+    top: -1px;
     &:after {
       content: " ";
       top: 1px;
@@ -197,7 +196,7 @@
   &-placement-left &-arrow,
   &-placement-leftTop &-arrow,
   &-placement-leftBottom &-arrow {
-    right: 0;
+    right: -1px;
     border-right-width: 0;
     border-left-color: @popover-arrow-outer-color;
     &:after {

components/style/themes/default.less

@@ -67,7 +67,7 @@
 @shadow-1-down          : 0 1px 6px @shadow-color;
 @shadow-1-left          : -1px 0 6px @shadow-color;
 @shadow-1-right         : 1px 0 6px @shadow-color;
-@shadow-2               : 0 1px 8px @shadow-color;
+@shadow-2               : 0 2px 8px @shadow-color;
 
 // Buttons
 @btn-font-weight        : 500;
@@ -193,8 +193,6 @@
 @popover-bg: #fff;
 //** Popover maximum width
 @popover-min-width: 177px;
-//** Popover border color
-@popover-border-color: @border-color-base;
 //** Popover arrow width
 @popover-arrow-width: 4px;
 //** Popover arrow color
@@ -202,4 +200,4 @@
 //** Popover outer arrow width
 @popover-arrow-outer-width: (@popover-arrow-width + 1);
 //** Popover outer arrow color
-@popover-arrow-outer-color: fadein(@popover-border-color, 5%);
+@popover-arrow-outer-color: fadeout(@border-color-base, 30%);