.controller, header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.info {
    background: #cff;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid #777;
}

canvas {
    margin-top: 8px;
    border: 1px solid black;
    background-color: #f8f8f8;
}

main {
    display: flex;
    justify-content: center;
}

#matrix {
    font-family: monospace;
    white-space: pre;
    margin-left: 20px;
    line-height: 1.2em;
}

#matrix td:first-child {
    border-left: 1px solid #777;
}

#matrix td:last-child {
    border-right: 1px solid #777;
}

#matrix td {
    padding: 4px;
    text-align: center;
}