body {
    background: #1f2029;
    color: #C2C1C8;
    font-family: calibri;
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1462889/pat.svg');
    background-size: 50%;
  }
  
  ::-webkit-scrollbar {
    width: 15px;
  }
  
  ::-webkit-scrollbar-track {
    background-color: #a7d4ff;
    box-shadow: -10px 8px 24px rgba(16, 39, 112, .2);
    border: 5px solid #1F2029;
  }
  
  ::-webkit-scrollbar-thumb {
    background-color: #a7d4ff;
    border-radius: 12px;
    box-shadow: -10px 8px 24px rgba(255, 235, 167, .2);
  }
  
  ::-webkit-scrollbar-button {
    background-color: #1F2029;
    color: #a7d4ff;
  }
  
  ::-webkit-scrollbar-corner {
    background-color: black;
  }
  
  #back_img {
    width: 70px;
    height: 70px;
    top: 15px;
    left: 15px;
    display: inline;
    box-shadow: none;
    position: absolute;
  }
  
  #back_a {
    position: relative;
  }
  
  #logo_img {
    width: 70px;
    height: 70px;
    top: 15px;
    right: 15px;
    display: inline;
    box-shadow: none;
    position: absolute;
  }
  
  #logo_a {
    position: relative;
    float: right;
  }
  
  #tit {
    text-align: center;
    font-size: 20px;
    font-weight: bold;
    color: #a7d4ff;
    text-shadow: -10px 8px 24px rgba(255, 235, 167, .2), 5px 5px 8px black;
  }
  
  #min15 {
    text-align: center;
    font-size: 15px;
    color: #a7d4ff;
    text-shadow: -10px 8px 24px rgba(255, 235, 167, .2), 5px 5px 8px black;
  }
  
  #cardtop {
    border: 1px solid #ffeaa700;
  }
  
  .layout {
    display: inline-block;
    text-align: center;
    width: 100%;
  }
  
  .button {
    padding-top: 18px;
    padding-bottom: 18px;
    display: inline-block;
    background-color: #a7d4ff;
    box-shadow: 0 8px 24px 0 rgba(255, 235, 167, .2);
    text-decoration: none;
    border-radius: 3px;
    color: #2A2B38;
    width: 18%;
    text-align: middle;
    text-weight: bold;
    font-size: 15px;
    border-radius: 8px;
    margin-left: 20px;
    margin-right: 20px;
    font-weight: bold;
    cursor: pointer;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
  }
  
  .button:hover {
    background-color: #1F2029;
    color: #a7d4ff;
    text-shadow: 2px 2px 5px #7b7b83;
    box-shadow: 0 8px 24px 0 rgba(16, 39, 112, .2);
  }
  
  .button:active {
    background-color: #1F2029;
    color: #a7d4ff;
    text-shadow: 2px 2px 5px #7b7b83;
    box-shadow: 0 8px 24px 0 rgba(16, 39, 112, .2);
  }
  
  .stitle {
    color: #a7d4ff;
    text-align: center;
    font-size: 40px;
    font-weight: bold;
    text-shadow: 0 8px 24px 0 rgba(255, 235, 167, .2);
  }
  
  .nuttai {
    border-right: 0.1vw solid transparent;
    width: 15%;
  }
  
  .nuttai {
    font-weight: bold;
    color: #000000;
    background-color: #a7d4ff;
    border: 2px solid #000000;
    display: inline-block;
    text-align: center;
    text-decoration: none;
    font-size: 15px;
    -webkit-transition: all 300ms linear;
    transition: all 300ms linear;
    padding: 15px 10px;
    margin: 4px 2px;
    border-radius: 1vw;
    opacity: 1;
    transition: opacity .2s ease-in-out;
  }
  
  .nuttai:hover {
    background-color: #1F2029;
    color: #ffffff;
    opacity: 1;
  }
  
  .nuttai:active {
    transform: scale(0.95);
    background-color: #0dcaf0 !important;
    color: #ffffff;
    opacity: 1;
  }
  
  .btn-download {
    text-decoration: none;
  }
  
  /* Hiệu ứng chữ tự động viết ra */
  
  @keyframes naylen {
    0% {
      transform: translateY(0);
    }
  
    50% {
      transform: translateY(-3px);
    }
  
    100% {
      transform: translateY(0);
    }
  }
  
  .button-wrapper {
    display: flex;
  }
  .button-wrapper .btn {
    flex-basis: 50%;
    height: 50%;
    /* Chỉnh chiều cao của nút */
    margin-right: 10px;
    /* Tạo khoảng cách giữa các nút */
  }
  
  .button-wrapper a.btn-download:hover {
    font-weight: bold;
    border: 1px solid #ff00aa;
    background-color: #00d5ff;
    transform: scale(1.01); /* Phóng to nút lên 110% khi hover */
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1462889/pat.svg');
    background-size: 50%;
    background-color: #1f2029;
    color: #ffffff;
  }
  .button-wrapper .btn:last-child {
    margin-right: 0;
    /* Loại bỏ khoảng cách cuối cùng */
  }