.viewport {
  /* make the viewport the anchor for #dev_tools */
  position: relative;
  font-size: 0;
}
#dev_tools {
  /* make it float on top of the canvas within the viewport */
  position: absolute;
  /* align it to top-left corner */
  top: 0;
  left: 0;
  font-size: 16px;
  /* just in case, make its CSS layer above the canvas */
  z-index: 100;
}
a.data {
  background-color: rgba(0,0,0,100%);
  color: #00b140;
  font-family: 'Ubuntu Mono',monospace;
}
.code_box {
  border: #000000;
  border-style: solid;
  border-width: 1px;
  padding: 2.5px;
  font-size: calc(100% - 2.5px);
  border-radius: 5px;
  background: #a2a2a2;
  font-family: 'Ubuntu Mono',monospace;
}