html {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 100%;
  background: darkslategray;
}

#page-wrapper
{
  width: 640px;
  background: white;
    padding: 1em;
    margin:1 em auto;
    border-top: 5px solid cadetblue;
    box-shadow: 0 2px 10px rgba(0,0,0,0.8
}

h1
{
  margin-top: 0;
}

h2
{
  font-size: 0.9;
    text-transform: uppercase;
  color: #333;
}

hr
{
  margin: 1.5em 0;
    border: 0;
  border-top: 1px solid lightgray;
}

button
{
  display: inline-block;
  border-radius:50%;
  border: none;
  font-size: 0.9em;
    padding: 0.7em;
    background: cadetblue;
    color: white;
    -webkit-font-smoothing: antialiased;
    font-weight: bold;
    margin: 0.5em 0.25em 0;
    text-align:center;
}

button:hover, button:focus
{
  opacity: 0.75;
  cursor: pointer;
}

button:active
{
  opacity: 1;
  box-shadow: 0 -3px 10px rgba(0,0,0,0.1) inset;
}

img
{
  max-width: 640px;
}
   
img:-webkit-full-screen, img:-moz-full-screen, img:-msfullscreen, img:full-screen, img:fullscreen {
  max-width: none;
}