.centeredImage {
  position: fixed;
  top: 30%;
  left: 40%;
  margin-top: -20px;
  margin-left: -150px;
}
.HolyGrail-body {
  flex: 1;
  background-color: #708090;

}

.nav{
    border:1px solid #ccc;
    border-width:1px 0;
    list-style:none;
    margin:0;
    padding:0;
    text-align:center;
}
.nav li{
    display:inline;
}
.nav a{
    display:inline-block;
    padding:10px;
    padding: 30px 30px 30px 30px 30px;
  text-decoration: none;
  font-size: 25px;
  color: #0000cd;
  border: 1px solid #333;
  box-shadow: 8px 8px 5px #444;
  background-image: linear-gradient(180deg, #fff, #ffd700 40%, #daa520);
}

.nav a:hover {
  color: brown; 
}