.btn-primary {
  background: #c1dcff;
  border: 1px solid #00a;
  padding: 0.3em 1em;
  border-radius: 5px;
}
.btn-default {
  background: #eee;
  border: 1px solid #aaa;
  padding: 0.3em 1em;
  border-radius: 5px;
}
.btn-success {
  background: #cfc;
  border: 1px solid #0a0;
  padding: 0.3em 1em;
  border-radius: 5px;
}
.btn-danger {
  background: #fcc;
  border: 1px solid #a00;
  padding: 0.3em 1em;
  border-radius: 5px;
}

#panel {
  display:none;
  background-color: #7491dda3;
    z-index: 100;
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
}