diff --git a/_layouts/default.html b/_layouts/default.html
index 8bf2c64..e9adf7f 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -25,7 +25,7 @@
             padding: 10px; /* Example padding */
             font-family: 'Courier New', monospace; /* Monospaced font for code */
             /* Add other styling properties as needed */
-            border: 2px solid #00326d;
+            border: 1px solid #00326d;
             margin: 5px;
         }
         .language-python {
@@ -35,7 +35,7 @@
             padding: 10px; /* Padding around the code block */
             font-family: 'Courier New', monospace; /* Monospaced font for code */
             /* Add other styling properties as needed */
-            border: 2px solid #00326d;
+            border: 1px solid #00326d;
             margin: 5px;
         }
         .language-matlab {
@@ -45,7 +45,7 @@
             padding: 10px; /* Padding around the code block */
             font-family: 'Courier New', monospace; /* Monospaced font for code */
             /* Add other styling properties as needed */
-            border: 2px solid #00326d;
+            border: 1px solid #00326d;
             margin: 5px;
         }
         .highlight .hll {  color: #000000 background-color: #d5e3f3 }
@@ -149,6 +149,12 @@
         th:empty {
           display: none; /* This will make an empty header cell vanish */
         }            
+        
+        img {
+          display: block;
+          margin-left: auto;
+          margin-right: auto;        
+        }
     </style>
     
 </head>