diff --git a/build.py b/build.py
index 6fc5119..56a0c5d 100755
--- a/build.py
+++ b/build.py
@@ -259,7 +259,42 @@ text-align: center;
 .card img {{
 border: none;
 height: 4em;
-}}'''
+}}
+
+/**/
+
+.tabs {{
+display: flex;
+flex-wrap: wrap;
+}}
+.tabs > input {{
+display: none;
+}}
+.tabs > input:checked + label + div {{
+display: block;
+}}
+.tabs > label {{
+order: 1;
+}}
+.tabs > div {{
+display: none;
+flex-basis: 100%;
+order: 2;
+}}
+
+.tabs {{
+border: 1px solid;
+}}
+.tabs > input:checked + label {{
+background-color: gray;
+}}
+.tabs > label {{
+padding: 10px;
+}}
+.tabs > div {{
+padding: 10px;
+}}
+'''
     js_file = os.path.join(js, 'index.js')
     js_text = f'''\
 function check(tab) {{