style: nametag 大区块整体居中

assets/css/page3.css

@@ -29,6 +29,8 @@
 /* 演职员表大区块：4 × 9 姓名网格，背景 alpha 0.5 */
 .nametag-block {
   position: absolute;
+  left: 50%;
+  transform: translateX(-50%);
   z-index: 1;
   display: grid;
   background: rgba(10, 8, 6, 0.5);

assets/js/page3.js

@@ -140,7 +140,6 @@
     gapX: 1,
     gapY: 1,
     padding: 1,
-    left: 2,
     top: 12,
   };
 
@@ -151,7 +150,6 @@
 
   const block = document.createElement('div');
   block.className = 'nametag-block';
-  block.style.left = `${TAG.left}em`;
   block.style.top = `${TAG.top}em`;
   block.style.width = `${blockWidth}em`;
   block.style.height = `${blockHeight}em`;