Implementar una alternativa visual al color del progreso de la investigación

<span style="
position: absolute;
top: 49px;
left: 2px;
width: 30px;
height: 30px;
display: inline-block;
background: url(clker.com/cliparts/b/b/f/5/125…-warning-error.svg.hi.png) no-repeat;
background-size: 90px;
background-position: -60px 0;
z-index: 4;
"></span>


Adjunto imagen de demostracion
DEMO:
prntscr.com/439dsk

Hmm, i will think about and maybe include it ... thanks for your suggestions and the screenshots - i've stored them here in the board.