fixes mobile端宽度溢出

Author: woytu

static/css/index.css

@@ -1645,4 +1645,13 @@ code {
     background: transparent;
     position: relative;
     z-index: 1;
+}
+
+@media (max-width: 419px) {
+    .pre-div {
+        width: 100vw;
+        margin-left: -1rem;
+        margin-right: -1rem;
+        border-radius: 0;
+    }
 }