* {
    box-sizing: border-box;
}
body {
    font-family: 'Open Sans', sans-serif;
}
#game-field {
    flex-wrap: wrap;
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    padding: 5px;
    align-content:center;
}
.card {
    background-color: plum;
    color:plum;
    width: 20%;
    height: 150px;
    cursor: pointer;
    text-align:center;
    align-items: center;
    justify-content: center;
}
.card:hover {
    background-color: #af4541;
    color:#af4541;
    border: 10px solid black;
}
.card.revealed {
    color:black;
    background-color:peru;
}