javascript - Bootstrap light box, with next arrows not aligned -

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for 1 of web sites developing have used bootstrap light box, along next , buttons. slider when video or image clicked displayed in light box, , there next buttons navigates. while navigating arrow suppose in middle moves top. how can prevented moving? this how arrow should appear but when sliding arrow goes ad in picture.

the java script code light box 

ekkolightbox.prototype = {     modal_shown: function() {       var video_id,         _this = this;       if (!this.options.remote) {         return this.error('no remote target given');       } else {         this.gallery = this.$element.data('gallery');         if (this.gallery) {           if (this.options.gallery_parent_selector === 'document.body' || this.options.gallery_parent_selector === '') {             this.gallery_items = $(document.body).find('*[data-toggle="lightbox"][data-gallery="' + this.gallery + '"]');           } else {             this.gallery_items = this.$element.parents(this.options.gallery_parent_selector).first().find('*[data-toggle="lightbox"][data-gallery="' + this.gallery + '"]');           }           this.gallery_index = this.gallery_items.index(this.$element);           $(document).on('keydown.ekkolightbox', this.navigate.bind(this));           if (this.options.directional_arrows && this.gallery_items.length > 1) {             this.lightbox_container.append('<div class="ekko-lightbox-nav-overlay"><a href="#" class="' + this.strip_stops(this.options.left_arrow_class) + '"></a><a href="#" class="' + this.strip_stops(this.options.right_arrow_class) + '"></a></div>');             this.modal_arrows = this.lightbox_container.find('div.ekko-lightbox-nav-overlay').first();             this.lightbox_container.find('a' + this.strip_spaces(this.options.left_arrow_class)).on('click', function(event) {               event.preventdefault();               return _this.navigate_left();             });             this.lightbox_container.find('a' + this.strip_spaces(this.options.right_arrow_class)).on('click', function(event) {               event.preventdefault();               return _this.navigate_right();             });           }         }         if (this.options.type) {           if (this.options.type === 'image') {             return this.preloadimage(this.options.remote, true);           } else if (this.options.type === 'youtube' && (video_id = this.getyoutubeid(this.options.remote))) {             return this.showyoutubevideo(video_id);           } else if (this.options.type === 'vimeo') {             return this.showvimeovideo(this.options.remote);           } else if (this.options.type === 'instagram') {             return this.showinstagramvideo(this.options.remote);           } else if (this.options.type === 'url') {             return this.loadremotecontent(this.options.remote);           } else if (this.options.type === 'video') {             return this.showvideoiframe(this.options.remote);           } else {             return this.error("could not detect remote target type. force type using data-type=\"image|youtube|vimeo|instagram|url|video\"");           }         } else {           return this.detectremotetype(this.options.remote);         }       }     },     strip_stops: function(str) {       return str.replace(/\./g, '');     },     strip_spaces: function(str) {       return str.replace(/\s/g, '');     },     isimage: function(str) {       return str.match(/(^data:image\/.*,)|(\.(jp(e|g|eg)|gif|png|bmp|webp|svg)((\?|#).*)?$)/i);     },     isswf: function(str) {       return str.match(/\.(swf)((\?|#).*)?$/i);     },     getyoutubeid: function(str) {       var match;       match = str.match(/^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/);       if (match && match[2].length === 11) {         return match[2];       } else {         return false;       }     },     getvimeoid: function(str) {       if (str.indexof('vimeo') > 0) {         return str;       } else {         return false;       }     },     getinstagramid: function(str) {       if (str.indexof('instagram') > 0) {         return str;       } else {         return false;       }     },


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