Fix hyperlink to CNCF on https://k8s.io/docs/home/ (#33038)

* [bugfix/fix-cncf-hyperlink-on-home] fix🐛: Explicitly set the margin-top property

* [bugfix/fix-cncf-hyperlink-on-home] fix🐛:  remove important

* [bugfix/fix-cncf-hyperlink-on-home] format🥚:  Add comments to indicate the role of css

Author: jpanda-cn

static/css/gridpage.css

@@ -21,6 +21,15 @@
     padding: 0 30px 0 0;
     margin-bottom: 50px;
     min-height: 152px;
+  
+}
+/* 
+ * Remove the height of the H2 element pseudo-class and set the appropriate spacing 
+ * to avoid mistakenly overriding the styles of other elements 
+ */
+.launch-card h2::before {
+    margin-top: 1rem ;
+    height: 0 ;
 }
 
 .gridPage p {