[Theme Horse Support Team]

Hi Markus,

Please login to your dashboard go to Appearance -> Customize -> Ambition Theme Options -> Custom CSS and paste the below CSS code then click on Save & Publish button. Also do not forget to remove all the code that you have customize.

.hgroup-wrap {
    background-color: rgba(0, 0, 0, 0.8);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 10000;
}

Thank you!