:root {
  --color-bg: #7669B0;
  --color-btn-bg: #5FB6D8;
  --color-btn-bg-hover: #4DA1C6;
  --color-nav-link: #d3d6ff;
}
.navbar-light {
  background-color: var(--color-bg);
}
.navbar-light .navbar-brand {
  color:  var(--color-nav-link);
  text-align: center;
  line-height: 2;
  margin: -0.5rem;
  transition-duration: .25s;
}
.navbar-light .navbar-brand:hover {
  color: white;
}
.navbar-light .navbar-nav .nav-link {
  color: var(--color-nav-link);
}
.navbar-light .navbar-nav .nav-link.active {
  color: white;
}
.navbar-light .navbar-nav .nav-link:hover {
  color: white;
}
.btn.btn-primary {
  background-color: var(--color-btn-bg);
  color: white;
  border: none;
  outline: none;
  transition-duration: .25s;
}
.btn.btn-primary:hover,
.btn.btn-primary:focus {
  background-color: var(--color-btn-bg-hover);
  box-shadow: 0 0 5px 2px #9ed5eb;
  color: white;
  outline: none;
}
.navbar-toggler{
  border-color: white;
}
.navbar-toggler-icon {
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='white' viewBox='0 0 30 30'%3E%3Cpath stroke='white' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3E%3C/svg%3E");
}

main {
  padding: 1rem;
}
main.centered {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 90vh;
  padding-bottom: 20vh;
}
form {
  margin: 2rem 0;
}
.narrow {
  max-width: 450px;
  margin: 0 auto;
}
.alert ul {
  margin: 0;
  padding: 0; 
  list-style-type: none;
}
.alert ul li {
  padding: 0;
}
#os-platform {
  display: none;
}
#os-platform-text {
  color: white;
  background-color: var(--color-btn-bg);
  font-weight: bold;
  padding: .25rem .5rem;
}