body {
  background-color: #09092d;
  color: #f6f7fb;
  margin: 10px auto;
  max-width: 900px;
  font-family: 'Lato', sans-serif;
  height: 100vh;
}

main {
  height: 80%;
}

/* navbar styling */
header {
  border-bottom: gray 1px solid;
  width: 100%;
  height: 10%;
  background-color: #09092d;
}

nav {
  display: flex; 
  height: 100%;
}

nav a:link{
  text-decoration: none;
  color:#f6f7fb;
}

  nav a:visited{
    text-decoration: none;
    color:#f6f7fb;
  }

  nav a:hover{
    text-decoration: none;
    border-bottom: white 5px solid;
    padding: 1em;
  }

nav div:first-child{
  color: #f6f7fb;
  width: 10%;
  margin: auto 0;
  margin-left: 1%;
  font-size: 1.5em;
  font-family: 'Roboto', sans-serif;
}

nav ul {
  color: #f6f7fb;
  display: flex;
  width: 40%;
  margin-left: 5px;
}

nav li {
  margin: auto;
}

nav div:nth-last-child(2){
  background-color: #ffcd1f;
  color: #09092d;
  margin-left: auto;
  margin-right: 1%;
  margin-top: auto;
  margin-bottom: auto;
  padding: 5px 35px;
  border-radius: 2px;
  transition: 300ms;
}

nav div:last-child{
  background-color: #4255ff;
  margin-left: 1%;
  margin-right: 1%;
  margin-top: auto;
  margin-bottom: auto;
  padding: 5px 10px;
  border-radius: 2px;
  transition: 300ms;
}

nav div:nth-last-child(2):hover{
  background-color: #fbe07d;
}

#study-btn{
  color: #09092d;
}

nav div:last-child:hover{
  background-color: #1a29b9;
}

/* FlashCard & Sidebar Container */

#deck-title {
  width: 75%;
  margin-left: 25%;
  margin-top: 4rem;
  text-align: center;
  font-size: 2rem;
  font-family: 'Roboto', sans-serif;
}

section.flashcard-container{
  display: flex;
  min-height: 400px;
}

div.sidebar{
  /* border: 1px blue solid; */
  width: 25%;
  height: auto;
}

.flash-card-container {
  width: 70%;
  height: 350px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: auto;
  margin-top: auto;
}

.flip-card {
  background-color: transparent;
  width:100%;
  height: 100%;
  perspective: 1000px;
}

.flip-card-inner{
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.8s;
  transform-style: preserve-3d;
  cursor:pointer;
}

.flip-card-inner.is-flipped{
  transform: rotateX(180deg);
}

.flip-card-front, .flip-card-back{
  position:absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 15px;
  background-color: #2e3856;
  color:#f6f7fb;
  display:flex;
  justify-content: center;
  align-items: center;
}

#front-card, #back-card {
  height: auto;
  font-size: 3rem;
  font-family: 'Roboto', sans-serif;
}

.flip-card-back {
  transform: rotateX(180deg);
}

/* Button Bar */
#button-bar{
  display: flex;
  justify-content: space-evenly;
  margin-top: 10px;
}

#left-arrow{
  width: 50px;
  height: 20px;
  background-color:#2e3856;
  color: #f6f7fb;
  border: none;
  cursor: pointer;
}

#right-arrow{
  width: 50px;
  height: 20px;
  background-color:#2e3856;
  color: #f6f7fb;
  border: none;
  cursor: pointer;
}

/* Side bar */
.sidebar {
  background-color: #2e3856;
  border-radius: 5px;
}

.sidebar p{
  font-size: 2rem;
  margin: 1rem 0 1.75rem 1rem;
  font-family: 'Roboto', sans-serif;
}

ul {
  margin: 0 1rem;
}

ul#deck-list li {
  font-size: 0.75rem;
  margin: 1rem 0;
  border-bottom:#09092d 0.5px solid;
  padding-bottom: 1rem;
  color: #f6f7fb;
}

/* Search Form */
form {
  margin: 4rem 0;
  min-width: none;
}

label {
  margin-left: 2.5rem;
}

#name {
  width: 80%;
  height: 1.5rem;
  background-color: #09092d;
  border: none;
  color:#f6f7fb;
}

.search-bar{
  display: flex;
  margin:0 1rem;
}

.deck-btn {
  background-color:#4255ff;
  border: none;
  color:#f6f7fb;
  box-shadow: 1px 1px 1px 1px #09092d;
}

  .deck-btn:hover{
    background-color: #1a29b9;
    cursor: pointer;
  }

/* footer */
footer {
  display: flex;
  justify-content: space-between;
  border-top: gray 1px solid;
  color: #f6f7fb;
  /* height: 160px; */
  margin-top: 5rem;
  height: 20%;
  padding-top: 10px;
  padding-left: 5px;
  background-color: #09092d;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  align-self: flex-end;
}

.footer-nav ul {
  display: flex;
  width: 90%;
  flex-direction: column;
  justify-content: flex-end;
  row-gap: 10px;
}

.footer-nav a:hover {
  text-decoration: none;
  border-bottom: white 5px solid;
  padding: 0 0 5px 0;
}

.footer-nav div:nth-last-child(2) {
  background-color: #ffcd1f;
  color: #09092d;
  margin-left: auto;
  margin-right: 1%;
  margin-top: 15px;
  margin-bottom: 5px;
  padding: 5px 35px;
  border-radius: 2px;
  transition: 300ms;
}

.footer-nav div:last-child {
  text-align: center;
  background-color: #4255ff;
  margin-left: 1%;
  margin-right: 1%;
  margin-top: 5px;
  margin-bottom: 5px;
  padding: 5px 10px;
  border-radius: 2px;
  transition: 300ms;
}

@media (max-width: 900px) {
  /* p {
    color: red;
  } */
  
  nav {
    width: 900px;
    position: sticky;
  }

  section {
    width: 900px;
  }

}