diff --git a/doc/_themes/blue/static/default.css_t b/doc/_themes/blue/static/default.css_t
index 492b46ea41..e2127db1da 100644
--- a/doc/_themes/blue/static/default.css_t
+++ b/doc/_themes/blue/static/default.css_t
@@ -394,4 +394,12 @@ div.body ul.search li {
 div.linenodiv {
     min-width: 1em;
     text-align: right;
+}
+
+div.sphinxsidebar #searchbox input[type="text"] {
+    width:auto;
+}
+
+div.sphinxsidebar #searchbox input[type="submit"] {
+    width:auto;
 }
\ No newline at end of file