We have added a custom preloader option in BLO theme where you can use your own Preloader image.
First, create an SVG from Illustrator with Stroke path.
Export or save your SVG with from Illustrator. (If you don’t have an idea about SVG how to create you can hire a designer who can make an svg for you. Or you can hire our consultant team who can do this for you. )
Go to vivus-instant
Upload or drag your SVG file into the canvas.
There are few options to create animation in SVG. Save the file and open with the code editor. Just copy the code and paste into custom text area in theme customizer.