Add margin above file name

Author: ThioJoe

Tools/Centroid Center Calculator.html

@@ -63,7 +63,7 @@
 
         .upload-section { margin-bottom: 1.5rem; }
 
-        .file-name { color: #6b7280; margin-top: 0.5rem; font-size: 0.875rem; }
+        .file-name { color: #6b7280; margin-top: 0.75rem; font-size: 0.875rem; }
 
         .content-grid {
             display: grid;