style.css

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Itim', cursive;
}
body{
    background: #012E40;
}
.title{
    margin-top: 5%;
    color: white;
    text-align: center;
    font-size: 40px;
    margin-top: 5%;
    margin-bottom: 2em;
}

.matched{
    color: #EAEAEA;
    text-align: center;
    font-size: 25px;
    margin-bottom: 1em;
}
.hide{
    display: none;
}
.background{
    display: flex;
  align-items: center;
  justify-content: center;
}
.wrapper{
  padding: 25px;
  border-radius: 10px;
  background: #3CA6A6;
  box-shadow: 0 10px 30px rgba(235, 229, 229, 0.1);
}
.cards, .card, .view{
  display: flex;
  align-items: center;
  justify-content: center;
}
.cards{
  height: 400px;
  width: 400px;
  flex-wrap: wrap;
  justify-content: space-between;
}
.cards .card{
  cursor: pointer;
  position: relative;
  perspective: 1000px;
  transform-style: preserve-3d;
  height: calc(100% / 4 - 10px);
  width: calc(100% / 4 - 10px);
}
.card .view{
  width: 100%;
  height: 100%;
  position: absolute;
  border-radius: 7px;
  background: #EAEAEA;
  pointer-events: none;
  backface-visibility: hidden;
  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
  transition: transform 0.25s linear;
}
.card .front-view img{
  width: 19px;
}
.card .back-view img{
  max-width: 45px;
}
.card .back-view{
  transform: rotateY(-180deg);
}
.card.flip .back-view{
  transform: rotateY(0);
}
.card.flip .front-view{
  transform: rotateY(180deg);
}
.restart {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    margin-top: 2em;
}

#reset {
    color: white;
    border-radius: 8px;
    padding: 10px;
    font-size: 20px;
    border: none;
    cursor: pointer;
    background-color: #3CA6A6;
}

.signature {
    color: white;
    text-align: center;
    font-size: 25px;
    margin-top: 2em;
}

a:visited {
    color: white;
}