Sofia was in all white - a beatiful dress with a skirt, jacket, and long boots. She is completely alone on stage during the entire performance.
There are lots of blue lights, with flying shining stars and the sun in the backdrop on the very start of the song, until the beat hits in. Even though she has no backing help, she manages to capture us all with her energy and her voice. She does minimal movements during her performance, but the cameras move a lot, and catch every single thing that Sofia does, making it a good and strong television performance.
The music stops before the final part of the song, and the stage is covered in green laser lights, while all the other lights also turn green and move around in the audience. In this part Sofia manages to show how strong her vocal really is.
You can have a look at Sofia's rehearsal right here: