one <div>

Tree

Layered triangle canopy with a tiny trunk shadow.

HTML + CSS
<div class="od od-tree"></div>

.od {
  position: relative;
  display: block;
  box-sizing: border-box;
}
.od::before,
.od::after {
  content: '';
  position: absolute;
  box-sizing: border-box;
}

.od-tree {
  width: 0; height: 0;
  border-left: 34px solid transparent; border-right: 34px solid transparent;
  border-bottom: 36px solid #16a34a; filter: drop-shadow(0 10px 18px rgba(22,163,74,0.28));
}
.od-tree::before {
  width: 0; height: 0;
  border-left: 26px solid transparent; border-right: 26px solid transparent;
  border-bottom: 28px solid #22c55e; top: -18px; left: -26px;
}
.od-tree::after {
  width: 12px; height: 18px; background: #92400e; top: 34px; left: -6px; border-radius: 2px;
}