HTML/CSS float: left; is not working properly -


i'm reading headfirst css/html , i'm having issue example.

i'm attempting float body left of sidebar using float:left; it's not floating properly. i've been on html , css can't quite see what's wrong.

this want like:

enter image description here

and fiddle: https://jsfiddle.net/taubin/7lhz4wtd/

#main {    background: #efe5d0 url(images/background.gif) top left;    font-size:  105%;    padding:    15px;    margin:     0px 10px 10px 10px;    width:      420px;    float:      left;  }
<div id="allcontent">    <div id="header">    </div>    <div id="sidebar">      <p class="beanheading">        sidebar text      </p>      <p>        sidebar text      </p>    </div>    <div id="main">      <h1>quality coffee, quality caffeine</h1>      <p>        main text      </p>    </div>  </div>

any suggestions appreciated.

first, might issue adding margin , paddings, add size box though box has width of 420px, have calculate margins , paddings to, or use * { box-sizing: border-box; }, calculate width of element sum of sizes (padding, margin, width) , not exceed width.

second, order of elements important when floating, put main on top of sidebar, since elements start top bottom, when float top element, bottom element if wider, collapse , align main box.

screenshot reference:

enter image description here


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