send/app/ui/selectbox.js

const html = require('choo/html');

module.exports = function(selected, options, translate, changed) {
  let x = selected;

  return html`
    <select
      class="appearance-none cursor-pointer border rounded-sm bg-blue-lightest hover:border-blue focus:border-blue px-2 py-1 my-2 h-8"
      onchange="${choose}"
    >
      ${
        options.map(
          i =>
            html`
              <option value="${i}" ${i === selected ? 'selected' : ''}
                >${translate(i)}</option
              >
            `
        )
      }
    </select>
  `;

  function choose(event) {
    const target = event.target;
    const value = +target.value;

    if (x !== value) {
      x = value;
      changed(value);
    }
  }
};