html - CSS 3D transform appears flat ( orthographic? ) -

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on hover button flips fails show perspective. it's flat orthographic view of animation. using perspective property wrong?

@import 'https://necolas.github.io/normalize.css/latest/normalize.css';  /* //////////////////////////////// initial //////////////////////////////// */  html, body{ height:100% } body{ background:#eee }  #btn {    display:block; width:100px; height:100px; margin:0 auto; position:relative;    transform:translatey(-50%); top:50%; background:#333; color:#eee; border:0;    outline:0; text-transform:uppercase  }  /* //////////////////////////////// _persp_ //////////////////////////////// */  #btn{ perspective:1000px }  #btn:hover { transform:rotatex(180deg); transform-style:preserve-3d }  /* //////////////////////////////// _trans_ //////////////////////////////// */  #btn{ transition-property: transform; transition-duration:1s }
<!doctype html>  <html lang="en">    <head>      <meta name="viewport" content="width=device-width, initial-scale=1.0">      <meta charset="utf-8"> <meta name="robots" content="noindex, nofollow">      <link rel="stylesheet" href="base.css"> <title>web | animation</title>    </head>    <body>      <button id="btn">button</button>  <!-- ------------------------------ comment ------------------------------- -->    </body>  </html>

ok first need activate hardware acceleration in browser. second use browser specific prefixes : 

-webkit-transform: perspective(600px) rotatey(-180deg); -moz-transform: perspective(600px) rotatey(-180deg);

try structure :

<div id="parent">   <button id="button">button</button> </div>

css: 

#parent {   position: relative;   margin: 10px auto;   width: 450px;   height: 281px;   z-index: 1; } #button {   width: 100%;   height: 100%;   -moz-transform-style: preserve-3d;   -moz-transition: 1.0s linear;   -webkit-transform-style: preserve-3d;   -webkit-transition: 1.0s linear; } #parent:hover #button {   -webkit-transform: perspective(600px) rotatey(-180deg);   -moz-transform: perspective(600px) rotatey(-180deg); }

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