_sidebar.md

@@ -191,7 +191,10 @@
 </details>
 </details>
 
+<div align="center">
+
 #### :tools: [Maintenance](Maintenance)
+</div>
 
 <details><summary>[**STED**](Maintenance/STED)</summary>
 
@@ -233,14 +236,25 @@
 
 </details>
 
+<div align="center">
+
 #### :floppy_disk: [Software](Software)
 
 - [Zen Blue](Software/Zen-Blue)
 - [Zen Black](Software/Zen-Black)
 - [VisiView](Software/VisiView)
+</div>
+
+<div align="center">
 
 #### :bar_chart: [Image&Data Analysis](Image & Data Analysis)
+</div>
+
+<div align="center">
+
 #### :globe_with_meridians: [Server&Acquisition](Server & Acquisition)
+</div>
+
 # [TEST](TEST)
 
 # [TEST2](TEST2)
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