fix(Picker): adapted skyline (#3195)

Author: jarmywang

src/loading/loading.less

@@ -57,10 +57,10 @@
         height: 100%;
         background: conic-gradient(
           from 180deg at 50% 50%,
-          transparent 0deg,
-          transparent 60deg,
+          rgba(255, 255, 255, 0) 0deg,
+          rgba(255, 255, 255, 0) 60deg,
           currentColor 330deg,
-          transparent 360deg
+          rgba(255, 255, 255, 0) 360deg
         );
         mask: radial-gradient(transparent calc(50% - 1rpx), #fff 50%);
 

src/picker/picker.less

@@ -85,12 +85,12 @@
 
     &--top {
       top: 0;
-      background: linear-gradient(180deg, @picker-bg-color 0%, transparent 100%);
+      background: linear-gradient(180deg, @picker-bg-color 0%, rgba(255, 255, 255, 0) 100%);
     }
 
     &--bottom {
       bottom: 0;
-      background: linear-gradient(180deg, @picker-bg-color 0%, transparent 100%);
+      background: linear-gradient(180deg, @picker-bg-color 0%, rgba(255, 255, 255, 0) 100%);
       transform: matrix(1, 0, 0, -1, 0, 0);
     }
   }