body {
  font-family: verdana;
  color: white;
  background-image: url("spinning_cube3.gif");
  background-position: center;
  background-size:20%
}
img {
  width:350px;
  height:350px;
  border: 2px solid white;
}
a:link {
    font-weight: bolder;
    color: #40E0D0;
}
a:visited {
    color: #DE3163;
}
a:hover {
  color:#C0FF4E;
}
a:active {
  color: #FFDC00;
}
.header {
  border:10px solid #40E0D0;
  text-align: center;
  background-color: #17202A;
  margin:100px;
  padding:20px;
}
.tutorialbox {
  border-left: 10px solid #40E0D0;
  margin:50px 100px;
  padding:50px 100px 70px 100px;
  background-color: #17202A;
}
.end {
  border-left: 10px solid #40E0D0;
  margin: 50px 100px;
  padding:20px;
  background-color: #17202A;
}