styles.css

/*
 * Globals
 */

/* Custom default button */
.btn-secondary,
.btn-secondary:hover,
.btn-secondary:focus {
  color: #333;
  text-shadow: none; /* Prevent inheritance from `body` */
}

/*
 * Base structure
 */

body {
  text-shadow: 0 0.05rem 0.1rem rgba(0, 0, 0, 0.5);
  box-shadow: inset 0 0 5rem rgba(0, 0, 0, 0.5);
  background: linear-gradient(45deg, #1f2783, #251e33, #000);
  background-size: 400% 400%;
  animation: gradient 15s ease-in-out infinite;
  height: 100vh !important;
}

@keyframes gradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.cover-container {
  max-width: 48em;
}

/*
 * Header
 */

.nav-masthead .nav-link {
  padding: 0.25rem 0;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.5);
  background-color: transparent;
  border-bottom: 0.25rem solid transparent;
}

.nav-masthead .nav-link:hover,
.nav-masthead .nav-link:focus {
  border-bottom-color: rgba(255, 255, 255, 0.25);
}

.nav-masthead .nav-link + .nav-link {
  margin-left: 1rem;
}

.nav-masthead .active {
  color: #fff;
  border-bottom-color: #fff;
}