function colorBox(color, options) {
options = Object.assign({},{
size: '0.8em',
offset: '-0.4em'
}, options);
return html`<span style="display: inline-block; width: ${options.size}; height: ${options.size}; background-color: ${color}; vertical-align: ${options.offset}; margin: 0 2px;"> </span>`
}