.OK {    background:green; text-align:center; color:white; }
  .OK {    background:#002D42; text-align:center; color:white; }
  .OK::before {    content: "\2713";}
  .KO {    background:pink; text-align:center; color:red;}
  .KO {    background:#E9511D; text-align:center; color:white;}
  .KO::before {    content: "\2717";}  
  .PP {    background:lightgreen; text-align:center; color:white;}
  .PP {    background:#0CB3E0; text-align:center; color:white;}
  .PP::before {    content: "...";}  
  .NA {    background:grey; text-align:center; color:white;}
  .NA::before {    content: "NA";}