class - How do I affect all the classes on javascript? -

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here sample code html , css

body{   font-family: verdana, geneva, sans-serif; }  .box{   width: 140px;   height: 140px;   background-color: red;   display: none;   position:relative;   margin-left: auto;   margin-right: auto; }  .bold{   font-weight: bold; } .table{   border: 2px solid black;   height: 150px;   width: 150px; }     </style> 

<p class="bold">your time: <span id="time">0.000</span>s</p>  <table id="table">   <tbody>     <tr>       <td class="table"><div class="box"></div></td>       <td class="table"><div class="box"></div></td>       <td class="table"><div class="box"></div></td>     </tr>     <tr>       <td class="table"><div class="box"></div></td>       <td class="table"><div class="box"></div></td>       <td class="table"><div class="box"></div></td>     </tr>     <tr>       <td class="table"><div class="box"></div></td>       <td class="table"><div class="box"></div></td>       <td class="table"><div class="box"></div></td>     </tr>   </tbody> </table>  <script type="text/javascript">   function getrandomcolor() {      var letters = '0123456789abcdef'.split('');      var color = '#';      (var = 0; < 6; i++ ) {         color += letters[math.floor(math.random() * 16)];     }     return color;  }   var clickedtime; var createdtime; var reactiontime;   function makebox(){      createdtime=date.now();      var time = math.random();      time = 5000*time;      var box = document.getelementsbyclassname("box");      settimeout(function(){        if(math.random()>0.5){           (var i=0;i<box.length; i++) {               box[i].style.borderradius="100px";          }else{            (var i=0;i<box.length; i++) {               box[i].style.borderradius="0";         }          (var i=0;i<box.length; i++) {               box[i].style.backgroundcolor=getrandomcolor();          (var i=0;i<box.length; i++) {               box[i].style.display="block";          createdtime=date.now();     }, time); }         (var i=0;i<box.length; i++) {               box[i].onclick=function(){          clickedtime=date.now();          reactiontime=(clickedtime-createdtime)/1000;          document.getelementbyid('time')[0].innerhtml=reactiontime;          this.style.display="none";          makebox();    }     makebox();  </script>

my goal here display different shapes in 9 boxes @ once , i'm starting out first display shape in boxes when use code, nothing shows up. also, i've checked codes getting elements classes, seems bit more getting ids. , i've tried using loops able access elements don't know why doesnt work. :/

have applied css styles box class? if not, width , height 0 why won't see anything.

try adding in <head> of html:

<style> .box {     width:100px;     height:100px; } </style>

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