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Yes, you can! Kindly just copy and paste this script below under the Script Manager (Storefront > Script Manager) on your BigCommerce Dashboard/Panel. Once done, you can adjust the opacity value from 0.1 to 1. Please make sure to save your changes.

<script>

var style = document.createElement(‘style’);
style.innerHTML = ' .main-header {background: #FF8A65; opacity: 0.90; z-index:9999}
‘ ;
document.head.appendChild(style);

</script>