Fix css and syntax

src/views/playlist.vue

@@ -558,6 +558,25 @@ export default {
   }
 }
 
+@media (max-width: 600px) {
+  .playlist-info {
+    width: calc(100vw - 2 * var(--main-content-padding-x));
+    display: block;
+    .cover {
+      display: flex;
+      justify-content: center;
+      align-items: center;
+    }
+    .info {
+      margin-top: 24px;
+      margin-left: 0;
+      .title {
+        font-size: 48px;
+      }
+    }
+  }
+}
+
 .special-playlist {
   margin-top: 192px;
   margin-bottom: 128px;