add width style

Author: bradmartin

README.md

@@ -61,6 +61,7 @@ Recommended CSS styles.
 ```CSS
 .fab-button {
     height: 70;
+    width: 70; /// this is required on iOS - Android does not require width so you might need to adjust styles 
     margin: 15;
     background-color: #ff4081; 
     horizontal-align: right;