*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 20px 0;
  background: #6589f9;
}

h1 {
  text-align: center;
  font-family: "Lucida Grande";
  color: #FFFFFF;
}

/* score panel style */
.score-panel {
  text-align: center;
  font-family: "Lucida Grande";
  color: #FFFFFF;
  margin-bottom: 10px;


}

.grid {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-evenly;
}

.card {
  position: relative;
  transition: all 0.4s linear;
  transform-style: preserve-3d;
  margin: 5px;
}

.card,
.back,
.front {
  height: 150px;
  width: 150px;
}

.back,
.front {
  position: absolute;
  backface-visibility: hidden;
}

.front {
  background: url('../img/pokeball-2-1.png') no-repeat center center / contain;
}

.back {
  transform: rotateY(180deg);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center center;
}

/*style for two cards selected*/
.selected {
  transform: rotateY(180deg);
}

/*style for matches*/
.match .front {
  background-image: none !important;
}