Fix Callout content overflow

Author: samajammin

src/components/Callout.js

@@ -52,11 +52,11 @@ const Callout = ({
 }) => {
   return (
     <StyledCard className={className}>
-      {/* <Image
+      <Image
         fluid={image}
         alt={`${title} image`}
         maxImageWidth={maxImageWidth}
-      /> */}
+      />
       <Content>
         <div>
           <h3>{title}</h3>

src/pages/what-is-ethereum.js

@@ -236,6 +236,7 @@ const SingleCard = styled(StyledCard)`
 
 const StyledCallout = styled(Callout)`
   flex: 1 1 424px;
+  height: 100%;
 `
 
 const cards = [