add of mobile images, change style and update README.md

src/index.css

@@ -1,6 +1,5 @@
 :root {
   font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
-  line-height: 1.5;
   font-weight: 400;
   background-color: #0D0D0D;
 }