.black-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    max-width: 380px;
    height: 65px;
    margin: 0 auto;
    background-color: #383B42;
    border-radius: 60px;
    padding: 0 40px;
    transition: opacity 0.3s;
  }
  
  .black-button::before {
    content: "";
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 5px 0 5px 8px;
    border-color: transparent transparent transparent #383B42;
  }
  
  .black-button:hover {
    opacity: 0.8;
  }
  
  /* 丸 */
  .black-button span {
    position: relative;
    font-size: 18px;
    font-family: "Hiragino Sans", sans-serif;
    font-weight: 700;
    color: #fff;
    line-height: calc(28 / 16);
    letter-spacing: 0.02em;
    padding-right: 32px;
  }
  
  .black-button span::before {
    content: "";
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: #fff;
  }
  
  /* 三角 */
  .black-button span::after {
    content: "";
    position: absolute;
    top: 50%;
    right: 6px;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 4px 0 4px 6px;
    border-color: transparent transparent transparent #383B42;
  }
  
  .black-button:hover {
    opacity: 0.8;
  }