update

css/index.css

@@ -2,6 +2,7 @@
     padding: 0;
     margin: 0;
     box-sizing: border-box;
+    transition: 0.3s;
 }
 
 body {

css/user.css

@@ -14,6 +14,14 @@
     transform: scale(1.03);
 }
 
+.usercard>h2 {
+    transition: 0.3s;
+}
+
+.usercard>h2:hover {
+    text-decoration: underline;
+}
+
 .usercard>.avatar {
     block-size: 185px;
     display: grid;