html - Why is my height: 100% property not working? -


i need explained me. thought understood css; haven't bloody clue.

body {      margin:0;      padding:0;  }  #contain{      position: relative;      width: 100%      height: 100%;  }  #wizard{      position: absolute;      left: 5%;      width:10%;      height: 100%;      background-color: black;  }  #main{      position: absolute;      height: 100%;      left: 15%;      border-style: dashed;      border-color: red;  }
<!doctype html>  <html>      <head>          <title>demo</title>          <script>              //css here, removed purpose of question          </script>      </head>      <body>          <div id="contain">              <div id="wizard">                    </div>              <div id="main">                            </div>          </div>      </body>  </html>

this 1 of basic examples of css positioning, , i've used many times before. understand "incorrect", why? why see single red dot (the condensed, dashed border of #main) 15% left, , nothing else?

set height 100% body , html, , provide reference other elements.

you don't need set height 100% positioned elements, set top , bottom offsets 0. if want use height: 100%, may height due border, , can fix specifying property box-sizing: border-box.

body {    margin: 0;    padding: 0;  }  body, html {    height: 100%;  }  #contain {    position: relative;    width: 100%;    height: 100%;  }  #wizard {    position: absolute;    top: 0;    bottom: 0;    left: 5%;    width: 10%;    background-color: black;  }  #main {    position: absolute;    top: 0;    bottom: 0;    left: 15%;    right: 0;    border-style: dashed;    border-color: red;  }
<div id="contain">    <div id="wizard"></div>    <div id="main"></div>  </div>


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