body {
  height: 100vh;
  background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
    url("https://images.unsplash.com/photo-1559521783-1d1599583485?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1950&q=80");
  background-size: cover;
  background-position: center;
  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);
}
.cover-container {
  max-width: 60vw;
}

.nav-container {
  position: absolute;
  width: 60%;
  z-index: 1;
}

main {
  z-index: 1;
}
footer {
  z-index: 1;
}
.nav-link {
  padding: 0.25rem 0;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.5);
  margin-left: 1rem;
  border-bottom: 0.25rem solid transparent;
}

.nav-link:hover  {
  color: rgba(255, 255, 255, 0.5);
  border-bottom-color: rgba(255, 255, 255, 0.5);
}
.footer-link:hover {
  color: rgba(255, 255, 255, 0.5);
  border-bottom-color: rgba(255, 255, 255, 0.5);
}
.logout:hover {
  color: rgba(255, 255, 255, 0.5);
  border-bottom-color: #dc4c64;
}

.nav-link.active {
  color: white;
  border-bottom-color: white;
}

.btn-secondary,
.btn-secondary:hover {
  color: #333;
  text-shadow: none;
}

.slideshow {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}
.slideshow li {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-size: cover;
  background-position: 50% 50%;
  background-repeat: no-repeat;
  opacity: 0;
  z-index: 0;
  animation: imageAnimation 50s linear infinite;
}
.slideshow li:nth-child(1) {
  background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
    url(http://i.imgur.com/K3mPv14.jpg);
  background-position: center;
  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);
}
.slideshow li:nth-child(2) {
  background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
    url(http://i.imgur.com/SBEmFpv.jpg);
  animation-delay: 10s;
  background-position: center;
  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);
}
.slideshow li:nth-child(3) {
  background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
    url(http://i.imgur.com/emvhOnb.jpg);
  animation-delay: 20s;
  background-position: center;
  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);
}
.slideshow li:nth-child(4) {
  background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
    url(http://i.imgur.com/2LSMCmJ.jpg);
  animation-delay: 30s;
  background-position: center;
  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);
}
.slideshow li:nth-child(5) {
  background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
    url(http://i.imgur.com/TVGe0Ef.jpg);
  animation-delay: 40s;
  background-position: center;
  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);
}
@keyframes imageAnimation {
  0% {
    opacity: 0;
    animation-timing-function: ease-in;
  }
  10% {
    opacity: 1;
    animation-timing-function: ease-out;
  }
  20% {
    opacity: 1;
  }
  30% {
    opacity: 0;
  }
}