/* Define the "system" font family */
@font-face {
    font-family: system;
    font-style: normal;
    font-weight: 300;
    src: local(".SFNSText"), local(".HelveticaNeueDeskInterface"), local(".LucidaGrandeUI"), local("Ubuntu Light"), local("Segoe UI"), local("Roboto"), local("DroidSans"), local("Arial");
  }

body {
    background: black;
    color: white;
    font-family: 'system';
}

div.container {
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%;
    position: absolute; 
    display: table
}

p {
    display: table-cell; 
    vertical-align: middle
}

img.displayed {
    display: block; margin: 1em auto
}

p {
    text-align: center
}

body, html {
    height: 100%; 
    margin: 0; 
    padding: 0;
}