style.css

.jumbotron {
  background: white;
}

.mission-container {
  position: relative;
  background: #1abc9c;
  width: 300px;
  min-height: 200px;
  margin: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: 1px 1px 20px -10px black;
}

.btn-primary {
  position: absolute;
  bottom: 0px;
  left: 0px;
  width: 100%;
  background: black;
  border-radius: 0px;
  padding: 8px 16px;
  border: 0px solid white;
}
.btn-primary:hover {
  background: orange;
}

.is-visible {
  opacity: 0;
  display: none;
}

.btn-success {
  border-radius: 0px;
  padding: 8px 16px;
  border: 0px solid white;
  background: #1abc9c;
}

.btn-success:hover {
  box-shadow: 0px 1px 40px -20px black;
  background: black;
  transform: translateX(5px);
}

.btn-primary:focus {
  border: 1px solid transparent;
}

.jumbotron > img {
  width: 300px;
}

.sub-container {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 100px;
}

.lead {
  color: white;
}

.button-clicked {
  background: orange !important;
}

.button-clicked:after {
  content: " Click to hide";
  display: block;
  font-size: 0.8em;
}