Update style.css

Author: lucthienphong1120

assets/css/style.css

@@ -139,7 +139,7 @@ main {
 .certificate {
     position: relative;
     width: 70%;
-    min-height: 400px;
+    min-height: 500px;
     float: left;
     margin-right: 20px;
     border: 1px solid #ccc;
@@ -354,4 +354,4 @@ footer {
         animation: fadeIn 0.5s ease;
         display: none;
     }
-}
+}