body {
  background: white;
}

.centered {
  margin: auto;
}

.jumbotron {
  background-size: cover;
  color: white;
  background: #3c4147;
  border: 1px solid #fff;
  margin-left: 10px;
}

/* Spinner für Bootstrap anpassen */
.spinner-border {
  width: 3rem;
  height: 3rem;
  margin-bottom: 1rem;
}