feat: add input wrapper style (#3074)

Author: John60676

components/input/style/mixin.less

@@ -366,6 +366,11 @@
   padding: @input-padding-vertical-base @input-padding-horizontal-base;
   width: 100%;
   text-align: start;
+  background-color: @input-bg;
+  background-image: none;
+  color: @input-color;
+  font-size: @font-size-base;
+  line-height: @line-height-base;
 
   &:hover {
     .hover();