src/static/index.css

body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.map-canvas {
  width: 100%;
  height: 100%;
}

ul.messages {
  width: 30%;
  min-width: 10em;
  list-style: none;
}

.messages li {
  color: #FFF;
  background-color: rgba(0, 0, 0, .6);
  font-size: 10pt;
  padding: 3px 3px 3px 1em;
  border-radius: 4px;
  margin-bottom: 3px;
  text-indent: -.5em;
}

.messages li:before {
  font-weight: bold;
}

.messages li.info:before {
  content: "i ";
  color: #77F;
}

.messages li.error:before {
  content: "x ";
  color: red;
}