diff --git a/web/styles/portico/activity.css b/web/styles/portico/activity.css
index fae1dce88c..6fd04d5126 100644
--- a/web/styles/portico/activity.css
+++ b/web/styles/portico/activity.css
@@ -144,3 +144,13 @@ tr.admin td:first-child {
     border-color: hsl(0deg 0% 83%);
     border-radius: 2px;
 }
+
+.search-query.input-xxlarge {
+    width: 530px;
+}
+
+@media (width <= 767px) {
+    .search-query.input-xxlarge {
+        width: 100%;
+    }
+}
diff --git a/web/third/bootstrap/css/bootstrap.css b/web/third/bootstrap/css/bootstrap.css
index 8b98671f8b..95267b4b91 100644
--- a/web/third/bootstrap/css/bootstrap.css
+++ b/web/third/bootstrap/css/bootstrap.css
@@ -518,9 +518,6 @@ input:-ms-input-placeholder {
 input::-webkit-input-placeholder {
   color: #999999;
 }
-.input-xxlarge {
-  width: 530px;
-}
 input {
   margin-left: 0;
 }
@@ -1439,14 +1436,6 @@ button.close {
   .row {
     margin-left: 0;
   }
-  .input-xxlarge {
-    display: block;
-    width: 100%;
-    min-height: 30px;
-    -webkit-box-sizing: border-box;
-    -moz-box-sizing: border-box;
-    box-sizing: border-box;
-  }
   .input-append input {
     display: inline-block;
     width: auto;