function qwe(){
    var container = document.getElementById("center");
    var coll = 5;
    var width = container.clientWidth/coll;
    var height = container.clientHeight/coll;
    for (var i = 1; i<coll;i++){
        for (var j =1; j<coll;j++){
            var sp = document.createElement("span");
            sp.style.border="1px solid #A452E7";
            sp.style.width = width*i+"px";
            sp.style.height = height*j+"px";
            container.appendChild("sp");
        }
    }
}