html - Responsive text size using ems -


i trying learn responsive webdesign techniques , trying code website in responsive way. don't want use frameworks yet. problem div width in ems different on mobile on desktops. when viewing on desktop, h1 fits div , on mobile not. shouldn't same in both case? sizes in em.

here html code:

<!doctype html> <!--[if ie 8]>               <html class="no-js lt-ie9" lang="en" > <![endif]--> <!--[if gt ie 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->  <head>     <meta charset="utf-8">     <meta name="viewport" content="width=device-width">     <title>sieć z pasją</title>      <link rel="stylesheet" href="css/style.css">      <!-- google webfonts -->     <!-- font-family: 'expletus sans', cursive; -->         <link href='http://fonts.googleapis.com/css?family=expletus+sans' rel='stylesheet' type='text/css'>  </head> <body>     <div class="transparent-bg">         <h1><span class="hello">hello</span>         </br><span class="is">my name is</span>         </br><span class="adam">adam</span></h1>     </div> </body> </html>

css:

body {     background:url('../img/background.jpg') no-repeat center center fixed;     -webkit-background-size: cover;     -moz-background-size: cover;     -o-background-size: cover;     background-size: cover;     filter: progid:dximagetransform.microsoft.alphaimageloader(src='.mybackground.jpg', sizingmethod='scale');     -ms-filter: "progid:dximagetransform.microsoft.alphaimageloader(src='mybackground.jpg', sizingmethod='scale')"; } .transparent-bg {     background-color:rgba(185,178,160,0.6);     padding:2em;     padding-top:5em;     max-width:30em;     position:relative;     left:4em;     top:5em; } h1 {     font-family: 'expletus sans', cursive;     color:black;         line-height:1em; }     span.hello {         font-size:4em;     }     span.is {         letter-spacing:0.4em;         position:relative;         left:0.3em;     }     span.adam {         font-size:3em;         letter-spacing:0.15em;         position:relative;         top:0.3em;     }

here live version: adamlakomy.pl. appreciate help.

mobile version

the problem text sizes not re-sizing based on window. here great article understand responsive re-sizing.

to fix have few options.

the first use @media queries - can still use ems! note: when using ems should have base em others (including width, height, , other font sizes) based off of. can affect changing 1 font size. example

media , (max-width: 25em) {   html {     font-size:50%;   } }

this make text have half it's original size when screen smaller 25em width

a second option use javascript (this uses jquery well) it. pulled example this post, can find or come more eloquent solution if want use method. here example

$(function() {     $(window).bind('resize', function()     {         resizeme();         }).trigger('resize'); }); function resizeme() {     //standard height, body font size correct     var preferredheight = 768;        var displayheight = $(window).height();     var percentage = displayheight / preferredheight;     var newfontsize = math.floor(/*default font size*/ * percentage) - 1;      $("body").css("font-size", newfontsize); }

or use plugin don't recommend paragraphs of text, small amount work fine. 2 of common ones fittext , bigtext


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