Nuxt/lib/app/views/loading/default.html

<style>
body, html, #__nuxt {
  background-color: <%= options.background %>;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
  padding: 0;
  flex-direction: column;
}

.loader,
.loader:after {
  border-radius: 50%;
  width: 5rem;
  height: 5rem;
}

.loader {
  margin: 60px auto;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border: .5rem solid <%= options.color2 %>;
  border-left: .5rem solid <%= options.color %>;
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-animation: load8 1.1s infinite linear;
  animation: load8 1.1s infinite linear;
}

.loader.error {
  border-left: .5rem solid #ff4500;
  animation-duration: 5s;
}

@-webkit-keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

@keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
</style>

<script>
window.addEventListener('error', function() {
  var e = document.getElementById("loader");
  if (e) e.className += " error";
});
</script>

<div class="loader"><%= options.loading %></div>

<%= options.dev ? '<!-- https://projects.lukehaas.me/css-loaders -->' : '' %>