:root {
  --hero-img: url("https://images.unsplash.com/photo-1520607162513-77705c0f0d4a");
  --service-img: url("https://images.unsplash.com/photo-1552664730-d307ca884978");
  --about-img: url("https://images.unsplash.com/photo-1507679799987-c73779587ccf");
}