javascript - Set width to widest element while still having floats -

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so have sidebar container buttons, on first line there element floats left , element floats right. below them buttons various lengths, 1 button per line. in container. how can make buttons , container length of widest button? floating element right makes container wide sidebar, should max width, not default one. can accept answer in javascript css.

here i've done far: https://jsfiddle.net/ke2b7wq1/

css:

#sidebar{ width: 250px; height: 100%; border: 1px solid #000; } #left-float{ padding: 0 5px; background: #f00; float: left; } #right-float{ padding: 0 5px; background: #f00; float: right; } .button{ text-align: center; background: #bbb; clear: both; float: left; margin-top: 7px; width: 100%; } .pusher{ clear: both; height: 0; }

html:

<div id="sidebar"> <div id="container">     <div id="left-float">hello</div>     <div id="right-float">0</div>     <div class="button">lorem ipsum</div>     <div class="button">dolor sit amet</div>     <div class="button">foo bar foo bar</div>     <div class="button">lorizzle ipizzle</div>     <div class="button">final button</div>     <div class="pusher"></div> </div> </div>

set #container display:inline-block or float:left (don't forget clear floats).

floated

* {    -webkit-box-sizing: border-box;    -moz-box-sizing: border-box;    box-sizing: border-box;  }  #sidebar {    width: 250px;    height: 100%;    border: 1px solid #000;    overflow: hidden;  }  #container {    float: left;  }  #left-float {    padding: 0 5px;    background: #f00;    float: left;  }  #right-float {    padding: 0 5px;    background: #f00;    float: right;  }  .button {    text-align: center;    background: #bbb;    clear: both;    float: left;    margin-top: 7px;    width: 100%;    padding: 4px;  }  .pusher {    clear: both;    height: 0;  }
<div id="sidebar">    <div id="container">      <div id="left-float">hello</div>      <div id="right-float">0</div>      <div class="button">lorem ipsum</div>      <div class="button">dolor sit amet</div>      <div class="button">foo bar foo bar</div>      <div class="button">lorizzle ipizzle</div>      <div class="button">final button</div>      <div class="pusher"></div>    </div>  </div>

inline-block

* {      -webkit-box-sizing: border-box;      -moz-box-sizing: border-box;      box-sizing: border-box;  }    #sidebar{      width: 250px;      height: 100%;      border: 1px solid #000;    }    #container {      display:inline-block;  }  #left-float{      padding: 0 5px;      background: #f00;      float: left;  }  #right-float{      padding: 0 5px;      background: #f00;      float: right;  }  .button{      text-align: center;      background: #bbb;      clear: both;      float: left;      margin-top: 7px;      width: 100%;      padding:4px;  }  .pusher{      clear: both;      height: 0;  }
<div id="sidebar">      <div id="container">          <div id="left-float">hello</div>          <div id="right-float">0</div>          <div class="button">lorem ipsum</div>          <div class="button">dolor sit amet</div>          <div class="button">foo bar foo bar</div>          <div class="button">lorizzle ipizzle</div>          <div class="button">final button</div>          <div class="pusher"></div>      </div>  </div>


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