diff --git a/docs/assets/css/styles.css b/docs/assets/css/styles.css
index fad31e3..8db5a2e 100644
--- a/docs/assets/css/styles.css
+++ b/docs/assets/css/styles.css
@@ -198,8 +198,9 @@ pre {
 }
 
 .sys-img {
-  width: 70%;
-  text-align: center;
+  width: 90%;
+  margin: 0 auto;
+  display: block;
 }