_validateStyles(styles) {
    // Position cannot be static.
    if (styles.position === 'static') {
      this.element.style.position = 'relative';
    }

    // Overflow has to be hidden.
    if (styles.overflow !== 'hidden') {
      this.element.style.overflow = 'hidden';
    }
  }
Ensures the shuffle container has the css styles it needs applied to it.
@param {Object} styles Key value pairs for position and overflow.
@private