body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.container {
    margin: auto;
    padding: 1px;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.hidden {
    display: none;
}

header {
    text-align: center;
}

.multi-group {
	margin: 10px 0;
    display: flex;
    flex-wrap: wrap;
}

.col {
	max-width: 30em;
	display: flex;
    flex-wrap: wrap;
}

.group {
    margin: 5px 1%;
    display: flex;
    align-items: start;
    flex-wrap: wrap;
    gap: 10px;
}

canvas {
    border: 1px solid #ccc;
    background: #fafafa;
}