main.css

* {
  box-sizing: border-box;
}

body {
  background-color: #292932;
  padding: 40px;
  font-family: 'Open Sans', sans-serif;
  margin: 0;
}

header {
  max-width: 1200px;
  margin: 0 auto;
}


h1 {
  font-family: 'Londrina Solid', cursive;
  font-size: 72px;
  margin: 0;
  color: white;
}

@media screen and (max-width: 667px){
  h1 {
    font-size: 50px;
  }
}

header img {
  height: 29px;
}

.heading-content {
  display: grid;
  grid-template-columns: 1fr;
  grid-gap: 20px;
}

@media screen and (min-width: 662px){
  .heading-content {
    grid-template-columns: 2.5fr 1fr;
  }
}

.contribute-callout {
  padding: 0 20px 20px 20px;
  margin: 20px 0 0 0;
  border: 3px solid #fae6e9;
}

.contribute-callout p {
  color: white;
  text-align: center;
}

.contribute-callout a {
  color: #292932;
  background-color: #effae6;
  padding: 15px;
  font-weight: 900;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  display: block;
  transition: .5s;
}

.contribute-callout a:hover {
  background-color: gold;
  transition: .5s;
}

.contribute-callout img {
  height: 27px;
}

.header {
  background-color: lavender;
  margin: 20px 0 0 0;
  border: 1px solid lavender;
  padding: 10px 20px;
}

h2 {
  color: #292932;
}

#filters {
  max-width: 1200px;
  margin: 0 auto 30px auto;
  padding: 25px 0;
  display: grid;
  grid-template-columns: 1fr;
  grid-gap: 20px;
  border-bottom: 2px solid white;
}

@media screen and (min-width: 662px){
  #filters {
    grid-template-columns: .5fr .5fr .5fr .5fr .5fr;
  }
  #filters p {
    text-align: left;
  }
}

@media screen and (min-width: 992px){
  #filters {
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
  }
}

#filters p {
  color: white;
  font-size: 18px;
  text-align: center;
}

#filters button {
  border: 0;
  border-radius: 0;
  font-size: 18px;
  cursor: pointer;
  color: #292932;
  padding: 15px;
  font-weight: 900;
  text-transform: uppercase;
  transition: .5s;
}

#filters .musical-filter {
  background-color: #fae6e9;
}

#filters .tv-filter {
  background-color: #faefe6;
}

#filters .movie-filter {
  background-color: #effae6;
}

#filters .all-filter {
  background-color: #e6f6fa;
}

#filters button:hover {
  background-color: gold;
  transition: .5s;
}

#emojis {
    display: grid;
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
    grid-gap: 20px;
    max-width: 1220px;
    margin: auto;
    margin-bottom: 30px;
}

@media screen and (min-width: 662px){
  #emojis {
    grid-template-columns: 1fr 1fr;
  }
}

@media screen and (min-width: 992px){
  #emojis {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media screen and (min-width: 1200px){
  #emojis {
    grid-template-columns: 1fr 1fr 1fr 1fr;
  }
}

.emoji-card {
    display: inline-block;
    text-align: center;
    border-radius: 5px;
    position: relative;
    cursor: pointer;
}

.emoji-images img {
    width: 42px;
    margin-right: 5px;
}

@media screen and (max-width: 992px){
  .emoji-images img {
    width: 48px;
  }
}

.emoji-images img:last-child {
  margin-right: 0;
}

.emoji-images {
  border-radius: 5px 5px 0 0;
  box-shadow: 5px 5px 10px rgba(0,0,0,.1);
  position: relative;
  background-color: white;
  padding: 20px 15px;
  border-bottom: 2px solid #292932;
}

.emoji-card-title {
  border-radius: 0 0 5px 5px;
  box-shadow: 5px 5px 10px rgba(0,0,0,.1);
  transition:all .2s;
  transition: visibility 0s, height 0s, opacity 0.5s linear;
  margin-top: 10px;
  padding: 20px;
  margin: 0;
  background-color: lavender;
  cursor: auto;
}

.emoji-card:nth-child(2n) .emoji-card-title,
.emoji-card:nth-child(2n) .hint {
    background-color: #fae6e9;
}

.emoji-card:nth-child(3n) .emoji-card-title,
.emoji-card:nth-child(3n) .hint {
    background-color: #e6f6fa;
}

.emoji-card:nth-child(5n) .emoji-card-title,
.emoji-card:nth-child(5n) .hint {
    background-color: #effae6;
}

.emoji-card:nth-child(6n) .emoji-card-title,
.emoji-card:nth-child(6n) .hint {
    background-color: #faefe6;
}


.emoji-card-title > a {
  text-decoration: none;
  color: #292932;
}


.emoji-card-title > a:hover {
  color: #535379;
}

.emoji-card-title h3 {
  margin: 0;
}

.hide-card {
  opacity: 0;
  height: 0;
  visibility: hidden;
  transition: visibility 0s, opacity 0.5s linear;
  padding: 0;
}

.reveal-card {
  opacity: 1;
  visibility: visible;
  display: block;
}

.hint-container {
  position: absolute;
  right: -2px;
  top: 2px;
  height: 30px;
  width: 30px;
  overflow: visible;
  z-index: 9999;
}

i {
  font-size: 17px;
  background-color: white;
  border-radius: 50%;
  color: #292932;
}

.hint-symbol {
  background-color: #292932;
  height: 20px;
  width: 20px;
  border-radius: 50%;
}

.hint {
  opacity: 0;
  visibility: hidden;
  display: block;
  background-color: lavender;
  color: #292932;
  text-transform: capitalize;
  width: 100px;
  padding: 3px;
  border-radius: 5px;
  position: absolute;
  left: -82px;
  top: -30px;
  z-index: -1;
}

.hint-reveal {
  opacity: 1;
  visibility: visible;
}

.btn-reveal-all {
  outline: none;
  cursor: pointer;
  background-color: lavender;
  border: none;
  border-radius: 100%;
  position: fixed;
  bottom: 20px;
  right: 30px;
  width: 50px;
  height: 50px;
  z-index: 9999;
}

@media screen and (max-width: 1024px){
  .btn-reveal-all {
    bottom: 5px;
    right: 5px;
  }
}

.btn-reveal-all:before {
  content: '';
  border-radius: 100%;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #9696D4;
  z-index: -1;
  opacity: 0;
  -webkit-transform: scale3d(0.7, 1, 1);
  transform: scale3d(0.7, 1, 1);
  -webkit-transition: -webkit-transform 0.4s, opacity 0.4s;
  transition: transform 0.4s, opacity 0.4s;
  -webkit-transition-timing-function: cubic-bezier(0.2, 1, 0.3, 1);
  transition-timing-function: cubic-bezier(0.2, 1, 0.3, 1);
}

.btn-reveal-all:hover::before {
  opacity: 1;
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

.btn-reveal-all i {
  background: transparent;
  font-size: 2em;
}

footer {
  text-align: center;
  max-width: 1000px;
  margin: auto;
  border-top: 1px solid white;
  padding-top: 20px;
}

footer p {
  line-height: 26px;
  color: white;
  font-size: 18px;
}

footer span {
  font-weight: bold;
  letter-spacing: 0.5px;
  color: gold;
}

footer img {
  height: 19px;
}

footer a {
  color: #fff;
  text-decoration: underline;
}

#message {
  display: none;
  max-width: 1000px;
  margin: auto;
}

#message p {
  color: white;
  font-size: 18px;
  text-align: center;
}

.imdb-link {
  margin-top: 8px;
  border: 3px solid #352649;
  padding: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 200px;
}

.imdb-link-item {
  color: #352649;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
}

.imdb-link i {
  background: none;
  margin-right: 8px;
  font-size: 24px;
  color: #3c3a4a;
}

#secret-code {
  transform: translateY(-150px);
  display: flex;
}

#secret-code .emoji-img {
  flex: 1;
  margin-top: -75px;
  justify-content: center;
  display: flex;
  animation: falling 6s infinite linear;
}

@keyframes falling {
  0% {
    transform: translateY(0);
    opacity: 1;
  }
  100% {
    transform: translateY(2000px);
    opacity: 0;
  }
}

#secret-code .emoji-img:nth-child(3n) {
  animation-timing-function: ease;
}

#secret-code .emoji-img:nth-child(2n) {
  animation-timing-function: ease-in-out;
}

#secret-code .emoji-img:nth-child(4n) {
  animation-timing-function: ease-out;
}