緑のグラデーション立体ボタン（矢印付き）デザイン

<a href="#" class="green-btn">ボタン</a>

.green-btn {
  display: inline-block;
  font-family: 'Zen Maru Gothic', sans-serif;
  font-size: 18px;
  font-weight: bold;
  color: #fff;
  padding: 12px 36px 12px 28px;
  background: linear-gradient(#8bc34a, #388e3c);
  border: 2px solid #2e7d32;
  border-radius: 6px;
  position: relative;
  text-decoration: none;
  box-shadow: 0 4px 6px rgba(0,0,0,0.2);
  transition: 0.2s ease;
}

.green-btn::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
  width: 8px;
  height: 8px;
  border-top: 3px solid #fff;
  border-right: 3px solid #fff;
}

.green-btn:hover {
  background: linear-gradient(#9ccc65, #43a047);
  box-shadow: 0 6px 10px rgba(0,0,0,0.25);
}