fixed for banner on small screen (#213)

Author: nqviet

src/components/Banner/index.jsx

@@ -9,7 +9,7 @@ const Banner = () => {
     "Welcome to our BETA work listings site - Tell us what you think!";
 
   return (
-    <div styleName="banner">
+    <div styleName="banner" className="banner">
       <p styleName="header">
         {header}
 

src/components/Banner/styles.scss

@@ -20,7 +20,8 @@
     flex-direction: row;
     align-items: center;
     @include roboto-bold;
-    height: 50px;
+    line-height: 25px;
+    min-height: 50px;
     font-size: 20px;
     text-transform: uppercase;
   }