javascript - How can I make my CSS update consistently? -

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when click on button layout falls apart. when click on button css breaks apart layout. how update css layout divs properly?

$(document).ready(function(e) {    totalcount = 100;    (var = 0; < totalcount; i++) {      var newdiv = document.createelement("div");      newdiv.innerhtml = "number " + i;      var applyclass = "bgcolor"; //identify class      document.getelementbyid("maincontainer").appendchild(newdiv);      newdiv.id = "div" + i;      document.getelementbyid(newdiv.id).classname = applyclass;      $('#div' + i).click(callbackfunction());    }      function callbackfunction(e) {      return function() {        //remove instances of css        (var = 0; < totalcount; i++) {          $("#div" + i).removeclass('newcolor');        }        document.getelementbyid(this.id).classlist.add('newcolor');      }    }  });
div {    background-color: #ff0;    padding: 2px;    font-size: 12px;    float: left;    margin-left: 2px;    margin-right: 2px;    margin-top: 30px;    padding: 5px;    cursor: pointer;    -webkit-transition: .5s ease-in-out;    transition: .5s ease-in-out  }  .newcolor {    background-color: #00ffff;    font-size: 16px;    margin-left: 6px;    margin-right: 6px;    margin-top: 28px;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <body id="maincontainer">    </body>

you can achive removing 

 float

and making div this.

 div {         background-color: #ff0;         padding:2px;         font-size:12px;         word-wrap: break-word;//this 1 too. incase word becomes long.         display: inline-block;//this 1 has been added.         margin-left: 2px;         margin-right: 2px;         margin-top: 30px;         width:auto;         padding: 5px;         cursor:pointer;         -webkit-transition: .5s ease-in-out;         transition: .5s ease-in-out     }

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