body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background-color: #f0f0f0;
}

.ovalo {
  width: 300px;
  height: 150px;
  border: 0px solid #3498db;
  border-radius: 50%;
  position: relative;
}

.punto {
  width: 4px;
  height: 4px;
  background-color: black;
  border-radius: 50%;
  position: absolute;
  box-shadow: 
    0 0 6px rgba(0, 0, 0, 0.4),
    0 0 12px rgba(0, 0, 0, 0.2),
    0 0 18px rgba(0, 0, 0, 0.1);
}