$(function(){
    fixartimg();
    $(document).on("onresize",function(event,resizedwinwidth, resizedwinheight, scale){
        fixartimg();
    });
});

function fixartimg(){
    var winwidth = $(window).width();
    if(winwidth<720){
        $(".artcontent").find("img").each(function(){
            let w=$(this).width();
            if(w>winwidth){
                $(this).css("height","auto");
                $(this).css("width","100%");
            }
        })
    }
}