remove aria-hidden and add button aria role

src/components/close-button/close-button.jsx

@@ -7,6 +7,7 @@ import closeIcon from './icon--close.svg';
 
 const CloseButton = props => (
     <div
+        aria-label="Close"
         className={classNames(
             styles.closeButton,
             props.className,
@@ -15,10 +16,10 @@ const CloseButton = props => (
                 [styles.large]: props.size === CloseButton.SIZE_LARGE
             }
         )}
+        role="button"
         onClick={props.onClick}
     >
         <img
-            aria-hidden="true"
             className={styles.closeIcon}
             src={closeIcon}
         />

src/components/icon-button/icon-button.jsx

@@ -11,10 +11,10 @@ const IconButton = ({
 }) => (
     <div
         className={classNames(styles.container, className)}
+        role="button"
         onClick={onClick}
     >
         <img
-            aria-hidden="true"
             className={styles.icon}
             src={img}
         />