* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.container {
  display: grid;
  place-items: center;
  min-height: 100vh;
}

.heading {
  text-align: center;
  font-family: "Poppins", sans-serif;
  font-size: 2rem;
  font-weight: 500;
}


.cards {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 3em;
}
#restart-button { 
border-color: red;
color: black;
border-radius: 5px;
height: 30px;
width: 80px;

}


.card {
  height: 120px;
  width: 115px;
  background-color: blue;
  border-radius: 8px;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: 0.3s all ease;
}

.card:hover {
  transform: scale(1.25);
}

.card img {
  width: 80%;
  max-height: 90px;
  opacity: 0;
  transition: 0.3s all ease;
}

.card.clicked {
  background-color: goldenrod;
}

.card.checked {
  background-color: rgb(6, 246, 6);
}

.card.clicked img,
.card.checked img {
  opacity: 1;
}

.card.shake {
  background-color: red;
  animation: shake 0.8s;
}