body {
  margin: 0;
  font-family: sans-serif;
  background-color: #d0f0c0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  text-align: center;
}

.counter {
  font-size: 2rem;
  margin-bottom: 20px;
}

.field {
  position: relative;
  width: 90vw;
  max-width: 600px;
  height: 200px;
  border: 2px solid #555;
  overflow: hidden;
  background-color: #fff;
  border-radius: 10px;
}

.sheep {
  position: absolute;
  width: 80px;
  bottom: 0;
}

.fence {
  position: absolute;
  bottom: 0;
  left: 100px; /* 左寄せに変更 */
  width: 20px;
  height: 80px;
  background-color: brown;
}