* {
    box-sizing: border-box;
}

body {
    font-family: sans-serif;
    text-align: center;
}

hr {
    border-style: solid;
    border-color: #eee;
}

#game-field {
    display: flex;
    flex-wrap: wrap;
    max-width: 1024px;
    margin: 0 auto;
}

.card {
    background-color: #41cc9e;
    color: transparent;
    border: 15px solid white;
    width: 20%;
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 25px;
    user-select: none;
}

.card:hover {
    background-color: #19b984;
}

.card.showed {
    background: rgb(7, 49, 59);
    color: white;
}