Hello @choreo64,
Thanks for writing in!
You are having this issue because the color of your Headings which you have set in X > Theme Options > Typography > Headings were almost white. They only way to make it visible is to override the background color of the overlay. You need to add CSS code into X > Theme Options > CSS
The search overlay has x-searchform-overlay class. By default, the overlay is having this built in styling with a transparent white color:
.x-searchform-overlay {
background-color: rgba(255,255,255,0.925);
}
Feel free to add whatever CSS code you like inside the selector. You can change the background color in the example above.
We are unable to provide CSS code for the customization as it is outside of our support scope. The points above will be a good starting point and if you are interested you can learn more about CSS selectors and details here
We would love to know if this has worked for you. Thank you.