.card-finance,
.card-marketing,
.card-prospection {
  position: relative;
}

.card-finance > *,
.card-marketing > *,
.card-prospection > * {
  position: relative;
  z-index: -1;
}

.card-finance::before,
.card-marketing::before,
.card-prospection::before {
  position: absolute;
  top: -83px;
  left: -53px;
  font-size: 230px;
  font-weight: 900;
  font-family: 'Orbitron', sans-serif;
  color: #00BFFF;
  opacity: 0.8;
  z-index: -1;
  line-height: 1;
  filter: blur(3px);
}

.card-finance::before { content: '01'; }
.card-marketing::before { content: '02'; }
.card-prospection::before { content: '03'; }

.biseau {
  background:
    linear-gradient(to bottom right, transparent calc(50% - 1px), #ffffff calc(50% - 1px), #ffffff calc(50% + 1px), transparent calc(50% + 1px)) bottom right / 80px 80px no-repeat,
    linear-gradient(#ffffff, #ffffff) left bottom / calc(100% - 80px) 1px no-repeat,
    linear-gradient(#ffffff, #ffffff) top / 100% 1px no-repeat,
    linear-gradient(#ffffff, #ffffff) left / 1px 100% no-repeat,
    linear-gradient(#ffffff, #ffffff) top right / 1px calc(100% - 80px) no-repeat !important;
  background-color: #000000 !important;
}