div.bidbox > ul > li:nth-child(5n+1) {
  background-color: rgba(0,0,0,0.1);
  color:black;
  font-weight: bolder;
  border-color: rgba(0,0,0,1);
  border-width: 1px;
  border-left-style: outset;
  border-top-style: outset;
  border-right-style: outset;
  border-top-right-radius: 0.5em;
  border-top-left-radius: 0.5em;
}

div.bidbox > ul > li:nth-child(5n+2) {
  background-color: rgba(0,0,255,0.1);
  color:mediumblue;
  font-weight: bolder;
  border-color: rgba(0,0,255,1);
  border-width: 1px;
  border-left-style: outset;
  border-top-style: outset;
  border-right-style: outset;
  border-top-right-radius: 0.5em;
  border-top-left-radius: 0.5em;
}

div.bidbox > ul > li:nth-child(5n+3) {
  background-color: rgba(255,0,0,0.1);
  color:crimson;
  font-weight: bolder;
  border-color: rgba(255,0,0,1);
  border-width: 1px;
  border-left-style: outset;
  border-top-style: outset;
  border-right-style: outset;
  border-top-right-radius: 0.5em;
  border-top-left-radius: 0.5em;
}

div.bidbox > ul > li:nth-child(5n+4) {
  background-color: rgba(255,140,0,0.1);
  color:darkorange;
  font-weight: bolder;
  border-color: rgba(255,140,0,1);
  border-width: 1px;
  border-left-style: outset;
  border-top-style: outset;
  border-right-style: outset;
  border-top-right-radius: 0.5em;
  border-top-left-radius: 0.5em;
}

div.bidbox > ul > li:nth-child(5n) {
  background-color: rgba(0,255,0,0.1);
  color:darkgreen;
  font-weight: bolder;
  border-color: rgba(0,255,0,1);
  border-width: 1px;
  border-left-style: outset;
  border-top-style: outset;
  border-right-style: outset;
  border-top-right-radius: 0.5em;
  border-top-left-radius: 0.5em;
}