style.css

html {
  height: 100%;
  -webkit-user-select: none;
  user-select: none;
}

#bg {
  position: fixed; 
  top: -50%; 
  left: -50%; 
  width: 200%; 
  height: 200%;
}
#bg img {
  position: absolute; 
  top: 0; 
  left: 0; 
  right: 0; 
  bottom: 0; 
  z-index:5;
  margin: auto; 
  min-width: 50%;
  min-height: 50%;
}

#main{
    margin: 0 auto;
    text-align: center;
    width: 75vw;
    max-width: 720px;
    margin-top: 25vh;
    padding-bottom: 5vh;
}

.credit{
    position: fixed; 
    background:dimgray; 
    opacity: 0.75;
    width:101%;
    margin-left: -8px;
    bottom:0;
    font-size: 10px;
    color: black;
    text-align: center;
}

.credit a:link, a:visited, a:active, a:hover{
	color: black
}

.button{
  z-index:1;
  position: relative; 
  border-top: 5px solid #888888;
  border-left: 5px solid #999999;
  border-right: 5px solid #555555;
  border-bottom: 5px solid #666666;
  background-color: darkgray;
  display: inline-block;
  text-align: center;
  padding: 20px;
  margin: -2px;
  opacity: 0.75;

  -moz-transition: background-color 1s;
  -webkit-transition: background-color 1s;
  -o-transition: background-color 1s;
}

.button p{
  border-top: 2px black;
  margin: 16px;
  clear: both;
  text-align: center;
  opacity: 1;
  text
}

.button a:link, a:visited, a:active, a:hover{
  text-decoration: none;
  color:black;
}

.button:hover{
  background-color: #777777;
  -moz-transition: background-color 0.33s;
  -webkit-transition: background-color 0.33s;
  -o-transition: background-color 0.33s;
}

.button:active{
  background-color: white;
  -moz-transition: background-color 0.11s;
  -webkit-transition: background-color 0.11s;
  -o-transition: background-color 0.11s;
}