.body {
    width: 600px;
    margin: 20px auto;
  }

  .flex {
    display: flex;
    flex-direction: row;
    justify-content: center;
  }

  .vertical {
    flex-direction: column;
    justify-content: flex-start;
  }

  .speed-control {
    flex-direction: column;
  }

  .body {
    justify-content: center;
    width: 100%;
  }

  .between {
    justify-content: center;
  }

  label {
    text-align: center;
  }

  .space {
    justify-content: space-between;
  }

  .space-vertical {
    justify-content: space-between;
  }

  .vertical-reverse {
    flex-direction: column-reverse;
  }

  .topic-change {
    flex-direction: row-reverse;
    justify-content: end;
  }

  .item {
    margin: 4;
    margin-left: 10px;
    margin-right: 10px;
    width: 200px;
  }

  .item :first-child {
    margin: 0;
    width: 100%;
    height: 100%;
  }

  .border-primary {
    padding: 8px;
  }

  .selection {
    height: 48px !important;
  }

  .input {
    width: 75%;
  }

  .full {
    height: 100%;
  }

  p {
    margin: 0 8px;
  }

  .background-image {
    background-image: url('../image/background.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
  }

  /* modal */
  .modal {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1050;
    /* Default Bootstrap z-index for modal */
    display: none;
    width: 100%;
    height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    outline: 0;
  }

  .modal-dialog {
    position: relative;
    width: auto;
    margin: 1rem;
    /* Default margin */
    pointer-events: none;
  }

  .modal.fade .modal-dialog {
    transition: transform 0.3s ease;
    transform: translateY(-10px);
  }

  .modal.show .modal-dialog {
    transform: translateY(0);
  }

  .modal.modal-static .modal-dialog {
    transform: scale(1.05);
  }

  .modal-dialog-scrollable {
    height: calc(100% - 2rem);
    /* Adjust for margins */
  }

  .modal-dialog-scrollable .modal-content {
    max-height: 100%;
    overflow: hidden;
  }

  .modal-dialog-scrollable .modal-body {
    overflow-y: auto;
  }

  .modal-dialog-centered {
    display: flex;
    align-items: center;
    min-height: calc(100% - 2rem);
    /* Adjust for margins */
  }

  .modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    color: #212529;
    /* Default text color */
    pointer-events: auto;
    background-color: #fff;
    /* Default background */
    border: 1px solid #dee2e6;
    /* Default border color */
    border-radius: 0.3rem;
    /* Default border radius */
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
    /* Default box shadow */
    outline: 0;
  }

  .modal-backdrop {
    z-index: 1040;
    /* Default Bootstrap z-index for backdrop */
    background-color: rgba(0, 0, 0, 0.5);
    /* Default backdrop color */
  }

  .modal-header {
    display: flex;
    align-items: center;
    padding: 1rem;
    /* Default header padding */
    border-bottom: 1px solid #dee2e6;
    /* Default border color */
  }

  .modal-header .btn-close {
    padding: 0.5rem;
    /* Adjust padding */
    margin-left: auto;
    /* Align close button to the right */
  }

  .modal-title {
    margin-bottom: 0;
    line-height: 1.5;
    /* Default line height */
  }

  .modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: 1rem;
    /* Default body padding */
  }

  .modal-footer {
    display: flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: flex-end;
    padding: 0.5rem;
    /* Default footer padding */
    border-top: 1px solid #dee2e6;
    /* Default border color */
  }

  .modal-footer>* {
    margin: 0.5rem;
    /* Margin between footer elements */
  }

  @media (min-width: 576px) {
    .modal {
      margin: 1rem;
      /* Adjust for larger screens */
    }

    .modal-dialog {
      max-width: 500px;
      /* Default small modal width */
      margin: auto;
      /* Center modal */
    }

    .modal-sm {
      max-width: 300px;
      /* Small modal width */
    }
  }

  @media (min-width: 992px) {
    .modal-lg {
      max-width: 800px;
      /* Large modal width */
    }
  }

  @media (min-width: 1200px) {
    .modal-xl {
      max-width: 1140px;
      /* Extra large modal width */
    }
  }

  @media (max-width: 576px) {
    .modal-fullscreen {
      width: 100vw;
      max-width: none;
      height: 100%;
      margin: 0;

      .modal-content {
        height: 100%;
        border: 0;
        border-radius: 0;
      }

      .modal-header,
      .modal-footer {
        border-radius: 0;
      }

      .modal-body {
        overflow-y: auto;
      }
    }
  }