add the homepage's responsive

src/container/Homepage.jsx

   render () {
     return (
       <section className='homepage'>
-        <div className='container-fluid'>
+        <div className='container-fluid nopadding'>
           <HomepageCard />
         </div>
       </section>

src/css/HomepageCard.styl

   &__logo
     margin-left calc(50% - 90px) /* 90px => width: 180px / 2 */
     width 180px
+
+/**** MEDIA QUERIES ****/
+
+@media (min-width: min-sm) and (max-width: max-sm)
+
+  .homepagecard
+    width 575px
+
+@media (max-width: max-xs)
+
+  .homepagecard
+    width 380px