css - bug of loading background picture -

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i have strange probleme moment. wrote simple website looks like: enter image description here displays normally. when try refresh it, not often, maybe 1 time 10 freshes, display of background photo bugged like:enter image description here i'm new frontend design , don't know happened. can me? here html , css code, , bug appears chrome, firefox works well.

html code:

<!doctype html> <html>  <head>     <meta charset = "utf8">     <meta http-equiv="pragma" content="no-cache">     <link rel=stylesheet type=text/css href="{{ url_for('static', filename='login.css') }}">     <title> login page :) </title> </head> <body>    <div id="div_title">       <span id="title"> welcome wentong's website! </span>       </br>       <a href="{{ url_for('homepage') }}" id="guestlink">entrance guests here :)</a>   </div>    {% message in get_flashed_messages() %}     <div class=flash>{{ message }}</div>   {% endfor %}    <form action="{{ url_for('login') }}" method=post>       <div id = "div_login">           <span class="label">username:</span>           <input class="input" type=text name=username>           <br/>           <span class="label">password: </span>           <input class="input" type=password name=password>           <br/>           <input id="submit" type=submit value=login style="display:none">       </div>   </form> </body> </html>

and background css:

html {    background: url(images/aurora.jpg) no-repeat center center fixed;    -webkit-background-size: contain;    -moz-background-size: contain;    -o-background-size: contain;    background-size: contain; }

you can try place background image separate img tag such css rules:

.full-screen-background-image {   z-index: -999;   min-height: 100%;   min-width: 1024px;   width: 100%;   height: auto;   position: fixed;   top: 0;   left: 0; }

and place bottom of layout markup

<!doctype html> <html> <head>   ... </head> <body>   ...    <img class="full-screen-background-image" src="you-image.jpg" />   </body> </html>




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