/* ↓ canvasフルスクリーン用 */
html, body, #canvas {
    display: block;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background-color: #eee;
  }
/* ↑ canvasフルスクリーン用 */

table{
    border: 1px solid grey;
    border-collapse: collapse;
}
th{
    border: 1px solid grey;
}

td{
    border: 1px solid grey;
}
/*
@media screen and (max-width:980px){
    html, body, #canvas {
        display: block;
        width: 600px;
        height: 300px;
        margin: 0;
        padding: 0;
        background-color: #eee;
      }
}
*/