css - Why minimizing the window causing the HTML elements to disappear from the parent container itself? -


i have following html code me. have duly tried centrally align parent container div #header , childs within #header1 , #header2 respectively. when try minimize window parent container seems not centrally aligned , child headers seems collapsed after setting width explicitly width:50%; of parent container. why so? please explain , me fix this. note horizontal navigation bar below seems associated same bug mentioned above.

<!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 {     }     body {         border:black 2px solid;         background-color : grey;         padding:5px;     }     #header {         margin:10px auto;         background-color : red;         width:70%;         height:80px;             -webkit-border-radius:15px;         -moz-border-radius:15px;         border-radius:15px;     }     #header1 {           display:inline-block;         width:50%;         text-align:center;         line-height:80px;                }     #header2 {         display:inline-block;         width:50%;         text-align:center;         line-height:80px;     }     #navmenu {         list-style-type:none;         background-color:#444;         border:black 2px solid;                  text-align:center;         margin-bottom:20px;     }     #content {     }     #nav {     }     #navmenu li {         border:black 1px solid;         background:yellow;         border-radius:5px;         height:30px;         line-height:30px;         width:33%;         display:inline-block     }     #navmenu li {         text-decoration:none;                    display:block;     } </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>

the fixed height on #header prevented text visible on smaller screens there isn't enough space. removed height dynamic.

also added margin left , right of #header1 , #header2 don't stick eachother.

the horizontal menu items collapsing can fixed box-sizing, , width: 33.33%

jsfiddle

more info on box-sizing can found here: http://www.w3schools.com/cssref/css3_pr_box-sizing.asp

hope helped.


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