buttons fixed (#1)

- buttons fixed (1b98d81d3d17573820686e661b39fd8c8afd5957)


Co-authored-by: Oleksandr Lukashov <[email protected]>

materials/introduction.html

@@ -24,13 +24,19 @@
             text-align: center;
             vertical-align: middle;
             box-sizing: border-box;
+            height: 50px;
+            width: 180px;
+            overflow: hidden;
         }
+
         .link-button:hover {
             background-color: #c0dcfc;
         }
+
         .link-button img {
-            height: 20px;
-            width: auto;
+            height: 60%;
+            width: 60%;
+            object-fit: contain;
             display: block;
         }
         .links-container {