:root{
    --color-green:hsla(176,100%,44%,1);
    --color-red:hsla(337,100%,50%);
    --color-yellow:hsla(43,100%,50%);
  background: black;
}

*{
    padding: 0;
    margin: 0;
}

/* body{
    min-height: 100vh;
    max-width: 100%;
    padding: 0;
    margin: 0;
    display: grid;
    place-items: center;
    
} */

.neon-button{
   
    font-size: 2rem;
    display: inline-block;
 
    cursor: pointer;
    text-decoration: none;
    padding: 0.25em 1em;
    border-radius: 0.25em;
    text-shadow: 0 0 0.125em hsl(0 0% 100% / 0.3), 0 0 0.45em currentColor;
    position: sticky;
    background: transparent;
  
}



.neon-button::after{
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    opacity: 0;
    z-index: -1;
    transition: opacity 100ms linear;
}

.neon-button:hover::before,.neon-button:focus::before{
    opacity: 1;
}

.neon-button:hover::after,.neon-button:focus::after{
    opacity: 1;
}

.neon-button:hover,.neon-button:focus{
    color: #1f1800 !important;
    text-shadow: none;
}

.neon-button:nth-child(1){
    box-shadow: inset 0 0 0.5em 0 var(--color-red), 0 0 0.5em 0 var(--color-red);
    color: var(--color-red);
    border: 0.125em solid var(--color-red);
}

.neon-button:nth-child(1):before{
    background: var(--color-red);
}

.neon-button:nth-child(1):after{
    background: var(--color-red);
    box-shadow: 0 0 2em 0.5em var(--color-red);
}


#app {
  margin: 2em;
  border: 2px solid black;
  max-width: auto;
  display: block;
  margin: 0 auto;
  background-color: #B0F2B6
}

.info {
  text-align: center;
  padding-bottom: 1em;
  border-bottom: 1px solid #555;
}
.info > div {
  display: inline-block;
  width: 300px;
}
.info > div .label {
  margin-right: 5px;
}
.info > div .value {
  font-weight: bold;
}
.cards{
  text-align:center;
  
  
}
.cards .card {
  
  position: relative;
  display: inline-block;
  width: 150px;
  height: 200px;
  margin: 1em 1em;
  -moz-transition: opacity 0.5s;
  -o-transition: opacity 0.5s;
  -webkit-transition: opacity 0.5s;
  transition: opacity 0.5s;

}
.cards .card .front,
.cards .card .back {
  border-radius: 15px;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  background-color: green;
  -moz-backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -moz-transform: translateZ(0);
  -ms-transform: translateZ(0);
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  -moz-transition: -moz-transform 0.6s;
  -o-transition: -o-transform 0.6s;
  -webkit-transition: -webkit-transform 0.6s;
  transition: transform 0.6s;
  -moz-transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}
.cards .card .back {
  /*background-image: url("https://www.w3schools.com/css/paper.gif");*/
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  font-size: 12px;
}
.cards .card .front {
  -moz-transform: rotateY(-180deg);
  -ms-transform: rotateY(-180deg);
  -webkit-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
}
.cards .card.flipped .back, .cards .card.found .back {
  -moz-transform: rotateY(180deg);
  -ms-transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
}
.cards .card.flipped .front, .cards .card.found .front {
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
}
.cards .card.found {
  opacity: 0.5;
}

.splash {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
}
.splash .overlay {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.2);
}

/* bloc vous gagnez */
.splash .content {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
width: 400px;
 height: 200px;

  margin: auto;
  text-align: center;
  color: white;
  background-color: #000;
  -moz-border-radius: 10px;
  -webkit-border-radius: 10px;
  border-radius: 10px;
  -moz-box-shadow: 5px 5px 20px rgba(0, 0, 0, 0.8);
  -webkit-box-shadow: 5px 5px 20px rgba(0, 0, 0, 0.8);
  box-shadow: 5px 5px 20px rgba(0, 0, 0, 0.8);
  padding: 1em;
}
.splash .content .title {
  font-size: 1.8em;
  padding: 0.5em;
}
.splash .content .score {
  padding: 0.5em;
}
.splash .content button {
  margin-top: 1.0em;
  background-color: #444;
  padding: 5px 20px;
  -moz-border-radius: 4px;
  -webkit-border-radius: 4px;
  border-radius: 4px;
  border: 1px solid #555;
  color: White;
  font-size: 1.4em;
}
.card:hover{
  cursor:pointer;
}