Table: fix empty slot position

Author: jikkai

packages/theme-chalk/src/table.scss

@@ -17,18 +17,17 @@
 
   // 数据为空
   @include e(empty-block) {
-    position: relative;
     min-height: 60px;
     text-align: center;
     width: 100%;
     height: 100%;
+    display: flex;
+    justify-content: center;
+    align-items: center;
   }
 
   @include e(empty-text) {
-    position: absolute;
-    left: 50%;
-    top: 50%;
-    transform: translate(-50%, -50%);
+    width: 50%;
     color: $--color-text-secondary;
   }