--- a/devtools/client/netmonitor/src/assets/styles/Toolbar.css
+++ b/devtools/client/netmonitor/src/assets/styles/Toolbar.css
@@ -68,8 +68,21 @@
 }
 
 .devtools-checkbox-label {
   margin-inline-start: 10px;
   margin-inline-end: 3px;
   white-space: nowrap;
   margin-top: 1px;
 }
+
+/* Search box */
+
+.devtools-searchbox {
+  height: 100%;
+}
+
+.devtools-plaininput:focus {
+  border: 1px solid var(--blue-50);
+  margin-bottom: 0;
+  margin-top: 0;
+  box-shadow: none;
+}