.perpetuum_nav {
    margin: 10px;
}

.perpetuum_nav span {
    text-decoration: none;
    background: #fff;
    padding: 3px 6px;
    border: 1px solid #E6E6E6;
    color: #ccc;
    font-size: 11px;
    margin-left: 2px;
    margin-right: 2px;
}

.perpetuum_nav a:link, .perpetuum_nav a:visited, .perpetuum_nav a:hover, .perpetuum_nav a:active {
    text-decoration: none;
    color: #636363;
    background: #F9F9F9;
    border: 1px solid #E6E6E6;
    padding: 3px 6px;
    font-size: 11px;
    margin-left: 2px;
    margin-right: 2px;
}

.perpetuum_data {
   background: rgb(214, 234, 248);
   box-shadow: 0 -200px 100px -120px lightblue inset;
   animation: backgroundAnimation 3s infinite alternate;
}

@keyframes backgroundAnimation {
  50% {
    background: white;
    box-shadow: 0 -200px 100px -100px lightsteelblue inset;
  }
}