/* リセットCSS（気にしないでください） */
* {
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #ffffff;
}

#canvas {
    display: block;
    margin: 0 auto 20px;
}

table {
    margin: 20px auto;
    border-collapse: collapse;
    width: 80%;
}

th,
td {
    border: 1px solid #ddd;
    padding: 8px;
}

th {
    background-color: #f2f2f2;
}

.chart-container {
    width: 60%;
    margin: 20px auto;
}

/* .hue-gradient {
            background: linear-gradient(to right, red, yellow, lime, cyan, blue, magenta, red);
        }

        .saturation-gradient {
            background: linear-gradient(to right, white, black);
        }

        .value-gradient {
            background: linear-gradient(to right, black, white);
        } */


.chart-container canvas {
    height: 150px;
    width: 60%;
}