diff --git a/functions.php b/functions.php
index 9d36580..31f12ba 100644
--- a/functions.php
+++ b/functions.php
@@ -15,6 +15,10 @@ function alpha_bootstrapping() {
     $alpha_custom_header_details = array(
         'header-text'        => true,
         'default-text-color' => '#222',
+        'width'              => 1200,
+        'height'             => 600,
+        'flex-height'        => true,
+        'flex-width'         => true
     );
     add_theme_support( "custom-header", $alpha_custom_header_details );