body {
    margin: 0;
    padding: 0;
    background: #578a34;
    /* #1f293c */
}

.field {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 660px;
    background-color: #a2d149;
    /* #2a3953 */
}

.field_canvas {
    width: 100%;
    height: 100%;
    display: block;
    background-color: #a2d149;
    /* #2a3953 */
}