.whatsapp-button {
      position: fixed;
      bottom: 100px;
      right: 20px;
      z-index: 10000;
      background-color: #25D366;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      display: flex;
      justify-content: center;
      align-items: center;
      box-shadow: 0 4px 8px rgba(0,0,0,0.3);
      text-decoration: none;
    }

    .whatsapp-button img {
      width: 30px;
      height: 30px;
    }

    @media (max-width: 480px) {
      .whatsapp-button {
        width: 50px;
        height: 50px;
        bottom: 15px;
        right: 15px;
      }

      .whatsapp-button img {
        width: 24px;
        height: 24px;
      }
    }

    @media (max-width: 360px) {
      .whatsapp-button {
        width: 50px;
        height: 50px;
        bottom: 15px;
        right: 15px;
      }

      .whatsapp-button img {
        width: 24px;
        height: 24px;
      }
    }