fix:placement model and mask bugs (#144)

* fix:placement model and mask bugs

* chore: delete there is no necessary styles

Co-authored-by: 啊 <[email protected]>

Author: xintiaobrother

assets/index.less

@@ -3,7 +3,6 @@
 @drawer: drawer;
 .@{drawer} {
   position: fixed;
-  top: 0;
   z-index: 9999;
   transition: width 0s ease @duration, height 0s ease @duration, transform @duration @ease-in-out-circ;
   >* {
@@ -86,6 +85,7 @@
     }
   }
   &-left {
+    top: 0;
     left: 0;
     .@{drawer} {
       &-handle {
@@ -103,6 +103,7 @@
     }
   }
   &-right {
+    top: 0;
     right: 0;
     .@{drawer} {
       &-content-wrapper {
@@ -154,6 +155,7 @@
   }
   &-top {
     top: 0;
+    left: 0;
     .@{drawer} {
       &-handle {
         top: auto;
@@ -171,8 +173,8 @@
     }
   }
   &-bottom {
-    top: unset;
     bottom: 0;
+    left: 0;
     .@{drawer} {
       &-content-wrapper {
         bottom: 0;