.wrapper {
    height: 500px;
    width: 500px;
    position: relative;
}
.field {
    display: grid;
    height: 100%;
    width: 100%;
    position: relative;
}

.cell {
    border: 1px solid #ccc;
}
.cell.eatable {
    background-color: orange;
}
.cell.snake {
    background-color: darkgreen;
}

.message {
    display: none;
}
.game-over .message {
    top: 0;
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.75);
    color: red;
    font-size: 30px;
    line-height: 100%;
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
}

.restart {
    display: inline-block;
    margin: 2em;
    text-align: center;
}