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


/*
 * Base structure
 */
body::before {
  content: "";
  position: fixed;
  text-shadow: 0 .05rem .1rem rgba(0, 0, 0, 1);
  box-shadow: inset 0 0 5rem rgba(0, 0, 0, 0.8);
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.6); /* Dark semi-transparent layer */
  z-index: 0; /* Behind content */
}

body {
  position: relative; /* Required for ::before to position correctly */
  z-index: 1;
  background: url("../img/fort_mac.gif") no-repeat center center fixed;
  background-size: cover;
}

.cover-container {
  max-width: 42em;
  z-index: 2;
}

html {
  height: 100%;
}

main {
  flex: 1;
}

/*
 * Header
 */

.nav-masthead .nav-link {
  color: rgba(255, 255, 255, .5);
  border-bottom: .25rem solid transparent;
}

.nav-masthead .nav-link:hover,
.nav-masthead .nav-link:focus {
  border-bottom-color: rgba(255, 255, 255, .25);
}

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

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