body {
  display: grid;
  place-items: center;
  min-height: 90vh;
  background-color: #f0f0f0;
  font-family: "Arial Black", "Arial Bold", sans-serif;
}

.route-shield {
  position: relative; 
  width: 200px;
  height: 180px;
  background-color: white;
  border: 12px solid black;
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.route-shield .number {
  font-size: 90px;
  color: black;
  line-height: 1;
}

.route-shield::before {
  content: "";
  position: absolute;
  z-index: 1;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 112px solid transparent;
  border-right: 112px solid transparent;
  border-top: 80px solid black;
  bottom: -80px;
}

.route-shield::after {
  content: "";
  position: absolute;
  z-index: 2;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 100px solid transparent;
  border-right: 100px solid transparent;
  border-top: 68px solid white;
  bottom: -68px;
}
body {
  display: grid;
  place-items: center;
  min-height: 90vh;
  background-color: #f0f0f0;
  font-family: "Arial Black", "Arial Bold", sans-serif;
}

.route-shield {
  position: relative;
  width: 200px;
  height: 180px;
  background-color: white;
  border: 12px solid black;
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.route-shield .number {
  font-size: 90px;
  color: black;
  line-height: 1;
}

.route-shield::before {
  content: "";
  position: absolute;
  z-index: 1;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 112px solid transparent;
  border-right: 112px solid transparent;
  border-top: 80px solid black; 
  bottom: -80px;
}

.route-shield::after {
  content: "";
  position: absolute;
  z-index: 2; 
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 100px solid transparent;
  border-right: 100px solid transparent;
  border-top: 68px solid white;
  bottom: -68px;
}