Here is the CSS for a simple location dot with an image 👉 https://imgur.com/a/9L4WLOu

marker.css

.marker {
  display: block;
  border: none;
  border-radius: 50%;
  width: 70px;
  height: 70px;
  cursor: pointer;
  padding: 0;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  /* box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1); */
  border: 4px solid white;
  top: -40px;
  z-index: 1;
}

.marker-dot {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: rgb(136, 127, 255);
  /* border: 7px solid rgb(231, 227, 255); */
  box-shadow: 0 0 0 3px rgb(255, 255, 255), 0 0 0 20px rgba(20, 94, 255, 0.08);
  /* outline: 15px solid rgba(20, 94, 255, 0.1); */
}

.marker-dot::before {
  content: '';
  position: absolute;
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
  border-width: 14px 22px 0 22px;
  border-style: solid;
  border-color: white transparent transparent transparent;
}