html,
body {
  margin: 0;
  padding: 0;
  font-family: monospace;
}
* {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

.hidden {
  display: none !important;
}

body {
  position: relative;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  min-height: 100vh;
}

main {
  padding: 12px;
  text-align: center;
  -webkit-box-flex: 1;
  -ms-flex: 1 0 auto;
  flex: 1 0 auto;
}

main article {
  max-width: 600px;
  margin-bottom: 60px;
  text-align: left;
}

header {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  padding: 12px 12px 0 12px;
}

header nav ul {
  list-style-type: none;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

header nav ul li {
  margin: 0 12px;
}

header nav ul li a,
footer a,
.backToTopContainer {
  color: black;
  text-decoration: none;
}

footer a {
  font-weight: bold;
}

header nav ul li a:hover,
footer a:hover {
  color: grey;
}

.backToTopContainer:hover {
  text-decoration: underline;
}

.backToTopContainer {
  position: fixed;
  left: 0;
  bottom: 20%;
  background-color: rgba(175, 175, 175, 0.9);
  min-height: 40px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  text-align: center;
  padding: 12px 12px;
}

.backToTopContainer span {
  display: block;
}

.chapterInput {
  margin-top: 24px;
}

.chapterContainer {
  max-width: 100%;
}

footer {
  background-color: rgba(255, 255, 255, 0.9);
  width: 100vw;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  padding: 12px;
}

footer.fixed {
  position: fixed;
  bottom: 0;
}

footer div {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
}

footer div a {
  margin-right: 24px;
}

form label {
  display: block;
}

.lds-dual-ring {
  display: inline-block;
  width: 80px;
  height: 80px;
}
.lds-dual-ring:after {
  content: ' ';
  display: block;
  width: 64px;
  height: 64px;
  margin: 8px;
  border-radius: 50%;
  border: 6px solid #ccc;
  border-color: #ccc transparent #ccc transparent;
  -webkit-animation: lds-dual-ring 1.2s linear infinite;
  animation: lds-dual-ring 1.2s linear infinite;
}
@-webkit-keyframes lds-dual-ring {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes lds-dual-ring {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

.lds-dual-ring.fullScreen {
  width: 100vw;
  height: 100vh;
}
.lds-dual-ring.fullScreen:after {
  position: fixed;
  left: calc(50% - 36px);
  top: calc(50% - 36px);
}