* {
    list-style: none;
    text-decoration: none;
    color: #555;
    font-family: "Yu Gothic Medium", "游ゴシック Medium", YuGothic, "游ゴシック体",
      "ヒラギノ角ゴ Pro W3", "メイリオ", sans-serif;
  }
  
  body {
    margin: 0 auto;
    font-size: 16px;
    color: #555;
  }
  @media screen and (min-width: 1281px) {
    .contents {
      max-width: 90%;
      margin: 0 auto;
    }
  
    /* header & footer */
    header {
      border-bottom: solid 1px #ddd;
      padding-bottom: 10px;
      margin-top: 2rem;
    }
  
    .header-sp {
      display: none;
    }
  
  
    .nav-container {
      max-width: 985px;
      margin: 0 auto;
    }
  
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
  
    .nav-container > .logo {
      justify-content: start;
      align-items: center;
      width: 124px;
    }
  
    .nav-container > .logo > a > img {
      width: 124px;
    }
  
    .nav-container > .menu-left {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
  
    .menu-left > li > a {
      position: relative;
    }
  
    .menu-left > li > a::after {
      position: absolute;
      left: 0;
      content: "";
      width: 100%;
      height: 1px;
      background: #555;
      bottom: -1px;
      visibility: hidden;
    }
  
    .menu-left > li > a:hover::after {
      visibility: visible;
    }
  
    .nav-container > .menu-right {
      display: flex;
      justify-content: end;
      gap: 10px;
    }
  
    /* footer */
    footer {
      padding: 10px 0;
      font-size: 80%;
      text-align: center;
      width: 985px;
      margin: 0 auto;
    }
  
    .footer-sp {
      display: none;
    }
  
    .footer-nav-container {
      display: flex;
      justify-content: space-between;
    }
    .footer-top-border {
      border-top: solid 1px #ddd;
      padding: 10px 0;
      font-size: 80%;
      text-align: center;
      width: 100%;
      margin-top: 5rem;
    }
  
    .footer-nav-container > .footer-logo {
      justify-content: start;
      align-items: center;
    }
  
    .footer-nav-container > .footer-logo > a > img {
      width: 124px;
    }
  
    .footer-menu-left {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
  
    .sns {
      display: flex;
      align-items: center;
      gap: 10px;
    }
  
    .footer-bottom > ul {
      display: flex;
      gap: 10px;
      align-items: center;
      padding: 0;
    }
  
    .copyright {
      border-top: solid 1px #ddd;
      padding: 10px 0;
      font-size: 80%;
      text-align: center;
      width: 100%;
    }
  
    .title {
      font-size: 40px;
      font-weight: 100;
      text-align: center;
      margin-top: 5rem;
      margin-bottom: 5rem;
    }
  
    .content {
      margin-top: 3rem;
      max-width: 985px;
      margin: 0 auto;
    }
  
    .sub-title {
      font-size: 32px;
      border-bottom: 1px solid #555;
    }
  
    .example {
      background-color: #f8f8f8;
      padding: 1rem;
    }
  
    .example > ul > li {
      list-style-type: disc;
      font-size: 20px;
    }
  
    .voice {
      border: 1px solid #555;
      padding: 1rem;
      margin-bottom: 1rem;
    }

    .amazon-1 {
        width: 30%;
        height: auto;
    }

    .amazon-2 {
        width: 30%;
        height: auto;
    }

    .amazon-image {
        display: flex;
        justify-content: space-between;
    }

    .content-margin {
        margin-top: 5rem;
    }
    
    .amazon-image > img:first-child {
        object-fit:contain;
        width: 30%;
    }

    .amazon-image > img:nth-child(2) {
        object-fit: contain;
        width: 55%;
    }

    .amazon-3 {
        width: 100%;
    }
  }
  
  @media screen and (max-width: 1280px) {
    .contents {
      width: 90%;
      margin: 0 auto;
    }
  
    /* header & footer */
    header {
      border-bottom: solid 1px #ddd;
      padding-bottom: 10px;
      margin-top: 2rem;
    }
  
    .header-sp {
      display: none;
    }
  
    .nav-container {
      max-width: 985px;
      margin: 0 auto;
    }
  
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
  
    .nav-container > .logo {
      justify-content: start;
      align-items: center;
      width: 124px;
    }
  
    .nav-container > .logo > a > img {
      width: 124px;
    }
  
    .nav-container > .menu-left {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
  
    .menu-left > li > a {
      position: relative;
    }
  
    .menu-left > li > a::after {
      position: absolute;
      left: 0;
      content: "";
      width: 100%;
      height: 1px;
      background: #555;
      bottom: -1px;
      visibility: hidden;
    }
  
    .menu-left > li > a:hover::after {
      visibility: visible;
    }
  
    .nav-container > .menu-right {
      display: flex;
      justify-content: end;
      gap: 10px;
    }
  
    /* footer */
    footer {
      padding: 10px 0;
      font-size: 80%;
      text-align: center;
      width: 985px;
      margin: 0 auto;
    }
  
    .footer-sp {
      display: none;
    }
  
    .footer-nav-container {
      display: flex;
      justify-content: space-between;
    }
    .footer-top-border {
      border-top: solid 1px #ddd;
      padding: 10px 0;
      font-size: 80%;
      text-align: center;
      width: 100%;
      margin-top: 5rem;
    }
  
    .footer-nav-container > .footer-logo {
      justify-content: start;
      align-items: center;
    }
  
    .footer-nav-container > .footer-logo > a > img {
      width: 124px;
    }
  
    .footer-menu-left {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
  
    .sns {
      display: flex;
      align-items: center;
      gap: 10px;
    }
  
    .footer-bottom > ul {
      display: flex;
      gap: 10px;
      align-items: center;
      padding: 0;
    }
  
    .copyright {
      border-top: solid 1px #ddd;
      padding: 10px 0;
      font-size: 80%;
      text-align: center;
      width: 100%;
    }
  
    .title {
      font-size: 40px;
      font-weight: 100;
      text-align: center;
      margin-top: 5rem;
      margin-bottom: 5rem;
    }
  
    .content {
      margin: 3rem auto 0 auto;
      width: 90%;
    }
  
    .sub-title {
      font-size: 32px;
      border-bottom: 1px solid #555;
    }
  
    .example {
      background-color: #f8f8f8;
      padding: 1rem;
    }
  
    .example > ul > li {
      list-style-type: disc;
      font-size: 20px;
    }
  
    .voice {
      border: 1px solid #555;
      padding: 1rem;
      margin-bottom: 1rem;
    }

    .amazon-1 {
        width: 25%;
        height: auto;
    }

    .amazon-2 {
        width: 25%;
        height: auto;
    }

    .amazon-image {
        display: flex;
        justify-content: space-between;
    }

    .content-margin {
        margin-top: 5rem;
    }
    
    .amazon-image > img:first-child {
        object-fit:contain;
        width: 30%;
    }

    .amazon-image > img:nth-child(2) {
        object-fit: contain;
        width: 55%;
    }

    .amazon-3 {
        width: 100%;
    }
  }
  
  @media only screen and (max-width: 1000px) {
    header {
      margin: 0;
    }
  
  
  
    /* header & footer */
    .header-sp {
      display: flex;
      justify-content: center;
      align-items: center;
      margin-top: 1rem;
    }
  
    .nav-container {
      display: none;
    }
  
    .nav-container > .logo {
      justify-content: start;
      align-items: center;
      width: 124px;
    }
  
    .nav-container > .logo > img {
      width: 124px;
    }
  
    .nav-container > .menu-left {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
  
    .menu-left > li > a {
      position: relative;
    }
  
    .menu-left > li > a::after {
      position: absolute;
      left: 0;
      content: "";
      width: 100%;
      height: 1px;
      background: #555;
      bottom: -1px;
      visibility: hidden;
    }
  
    .menu-left > li > a:hover::after {
      visibility: visible;
    }
  
    .nav-container > .menu-right {
      display: flex;
      justify-content: end;
      gap: 10px;
    }
  
    .contents {
      width: 90%;
      margin: 0 auto 100px;
    }
  
    /* footer */
    footer {
  display: none;
    }
  
    .footer-sp {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    
    .copyright {
      border-top: solid 1px #ddd;
      padding: 10px 0;
      font-size: 80%;
      text-align: center;
      width: 100%;
    }
  
    .title {
      font-size: 40px;
      font-weight: 100;
      text-align: center;
      margin-top: 5rem;
      margin-bottom: 5rem;
    }
  
    .content {
      margin-top: 3rem;
    }
  
    .sub-title {
      font-size: 32px;
      border-bottom: 1px solid #555;
    }
  
    .example {
      background-color: #f8f8f8;
      padding: 1rem;
    }
  
    .example > ul > li {
      list-style-type: disc;
      font-size: 20px;
    }
  
    .voice {
      border: 1px solid #555;
      padding: 1rem;
      margin-bottom: 1rem;
    }

    .amazon-1 {
        width: 50%;
        height: auto;
        margin: 0 auto;
        display: block;
    }

    .amazon-2 {
        width: 65%;
        height: auto;
        margin: 0 auto;
        display: block;
    }

    .amazon-image {
        display: flex;
        justify-content: space-between;
    }

    .content-margin {
        margin-top: 5rem;
    }
    
    .amazon-image > img:first-child {
        object-fit:contain;
        width: 33%;
    }

    .amazon-image > img:nth-child(2) {
        object-fit: contain;
        width: 59%;
    }

    .amazon-3 {
        width: 100%;
    }
  }