styleKeyboard = function (keyboard) {
        var styleElement = function (el) {
            el.style.cursor = 'default';
            el.style.fontSize = '0px';
            el.style.height = settings.height + 'px';
            el.style.padding = 0;
            el.style.position = 'relative';
            el.style.listStyle = 'none';
            el.style.margin = 0;
            el.style.width = settings.width + 'px';
            el.style['-webkit-user-select'] = 'none';
        };

        styleElement(keyboard.container);
        styleElement(keyboard.el);
    }
Reset styles on keyboard container and list element.
@param {element} keyboard Keyboard container DOM element.