title: ScrollView not work
body: <p><a href="https://i.stack.imgur.com/ydsl2.png" rel="nofollow noreferrer">what my screen looks like now click this link</a></p>
  
  <p>I can not scroll horizontally due to some reasons, but I cannot figure out the problem, I have already set flex for the style and my code show as following:</p>
  
  <pre><code>&lt;View style={styles.contentContainer}&gt;
        &lt;ScrollView horizontal&gt;
          {meetups.map((meetup, i) =&gt; (
            &lt;View key={i} style={styles.meetupCard}&gt;
              &lt;View style={styles.meetupCardTopContainer}&gt;
                &lt;Text style={styles.meetupCardTitle}&gt;
                  {meetup.title}
                &lt;/Text&gt;
              &lt;/View&gt;
  
              &lt;View style={styles.meetupCardBottomContainer}&gt;
                &lt;Text style={styles.meetupCardMetaName}&gt;
                  {meetup.group.name}
                &lt;/Text&gt;
                &lt;Text style={styles.meetupCardMetaDate}&gt;
                  Mar 2m 6:00pm
                &lt;/Text&gt;
              &lt;/View&gt;
  
            &lt;/View&gt;
          ))}
        &lt;/ScrollView&gt;
      &lt;/View&gt;
  </code></pre>
  
  <p>and the styles define as following:</p>
  
  <pre><code>const styles = EStyleSheet.create({
    root: {
      flex: 1
    },
    titleContainer: {
      flex: 0.1,
      paddingHorizontal: '2.5%',
      paddingVertical: '2.5%'
    },
    title: {
      color: '#fff',
      fontSize: 25,
      fontFamily: 'SignikaRegular'
    },
    contentContainer: {
      flex:1
    },
    meetupCard: {
      height: 200,
      width: 175,
      marginHorizontal: '1.5%',
      borderWidth: 2,
      borderColor:'#fff',
      backgroundColor: '#40D4EB'
    },
    meetupCardTopContainer: {
      flex: 1,
      position: 'relative'
    },
    meetupCardBottomContainer: {
      flex: 0.5,
    },
    meetupCardMetaDate: {
      fontSize: 13,
      fontFamily: 'SignikaLight'
    }
  });
  </code></pre>
  
  <p>How I can make it scroll sucessfully?
  Thanks a lot!</p>