html - Why inline-block is not working to align two divs inside of a parent container div horizontally side by side? -


i have simple html template 

<!doctype html>  <html lang="en" xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8" /> <title></title> <style>     *{         margin:0px;         padding:0px;     }       <!--resetter rules browsers-->     #bodycontainer {         border:green 2px solid;     }     body {         border:black 2px solid;         background-color : grey;         padding:5px;     }     #header {         background-color : red;         width:70%;         height:80px;         border:black 2px solid;         padding:5px;     }     #header1 {         display:inline-block;         width:50%;         border:green 2px solid;      }     #header2 {         display:inline-block;         width:50%;         border:green 2px solid;     } </style> </head> <body> <div id="bodycontainer">     <div id="header">         <div id="header1"><h1>welcome</h1></div>         <div id="header2"><h1>you choose better !!    </h1></div>                 </div>     <div id="content">         <div id="contentheader">             <p>you select ... serve </p>         </div>         <div id="nav">             <ul id="navmenu">                 <li><a href="#">home</a></li>                 <li><a href="#">electronics</a></li>                 <li><a href="#">fashions</a></li>                                </ul>         </div>     </div>     <div id="sidebar">     </div>     <div id="footer">         <p>webapp version numbered v1.0. rights reserved. </p>     </div> </div> </body> </html>

but when set width 50% divs having ids header1 , header2 tend not occupy entire space of parent container div having id header , aligned horizontally side side. why ? missing here ? please explain basics newbie html , css.

first thing remove padding #header, give 2px border both #header1 , #header2 remove border: 2px solid green;

and thing display:inline-block takes white-space in html. so, remove whitespace between both div #header1 , #header2.

like: <div id="header1"><h1>welcome</h1></div><div id="header2"><h1>you choose better !! </h1></div>

here give vertical-align:top make vertically top.

*{          margin:0px;          padding:0px;      }        <!--resetter rules browsers-->      #bodycontainer {          border:green 2px solid;      }      body {          border:black 2px solid;          background-color : grey;          padding:5px;      }      #header {          background-color : red;          width:70%;          height:80px;          border:black 2px solid;      }      #header1 {          display:inline-block;          width:50%;          vertical-align: top;      }      #header2 {          display:inline-block;          width:50%;      vertical-align: top;      }
<div id="bodycontainer">      <div id="header">          <div id="header1"><h1>welcome</h1></div><div id="header2"><h1>you choose better !!    </h1></div>                  </div>      <div id="content">          <div id="contentheader">              <p>you select ... serve </p>          </div>          <div id="nav">              <ul id="navmenu">                  <li><a href="#">home</a></li>                  <li><a href="#">electronics</a></li>                  <li><a href="#">fashions</a></li>                                 </ul>          </div>      </div>      <div id="sidebar">      </div>      <div id="footer">          <p>webapp version numbered v1.0. rights reserved. </p>      </div>  </div>

check fiddle.


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