.dog {
        position: absolute;
        width: 15px;
        height: 15px;
        background-color: #808080;
        border-radius: 50%;
      }
      .wolf {
        position: absolute;
        width: 15px;
        height: 15px;
        background-color: #ff0000;
        border-radius: 50%;
      }
      .obstacle {
        position: absolute;
        background-color: #8b4513; /* Brown for obstacles */
        border: 1px solid #556b2f; /* Darker border */
      }

      .tree {
        background-col