update btns on mobile (#662)

Signed-off-by: Arhell <arhell333@gmail.com>

src/pages/index.js

@@ -29,7 +29,7 @@ function Feature({ imgUrl, title, description, reverse }) {
 
 const Button = ({ children, href }) => {
   return (
-    <div className="col col--2 margin-horiz--sm">
+    <div className="col col--2 margin--sm">
       <Link
         className="button button--outline button--primary button--lg"
         to={href}>

src/pages/styles.module.css

@@ -145,5 +145,6 @@
 
 .heroButtons {
   display: flex;
-  justify-content: center
+  justify-content: center;
+  flex-wrap: wrap;
 }