html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.container {
  max-width: 960px;
}

.custom-header {
  max-width: 700px;
}

.card-deck .card {
  min-width: 220px;
}

.border-top { border-top: 1px solid #e5e5e5; }
.border-bottom { border-bottom: 1px solid #e5e5e5; }

.box-shadow { box-shadow: 0 .25rem .75rem rgba(0, 0, 0, .05); }

.navbar-brand {
    color: black;
}

.enter-mail {
    text-align: center;
}

.launch {
    background-color: #CED3DC;
}

.submit-button {
    background-color: #325261;
    border-color: #325261;
}

.submit-button:hover {
    background-color: #4E8098;
    border-color: #4E8098;
}

footer {
    background-color: #4E8098;
}

.amazon-button {
    background-color: #ff9900;
    border-color: #ff9900;
}

.amazon-button:hover {
    background-color: #146eb4;
    border-color: #146eb4;
}
@media (min-width: 768px) {
  .display-4 {
    font-size: 4.5rem;
  }
}