discourse/app/assets/stylesheets/common/base/modal.scss

.modal-open {
  .dropdown-menu {
    z-index: z("modal", "dropdown");
  }
  .popover {
    z-index: z("modal", "popover");
  }
  .tooltip {
    z-index: z("modal", "tooltip");
  }
}

.bootbox.modal {
  position: fixed;
  z-index: z("modal", "content");
  overflow: auto;
  height: auto;
  background-color: $secondary;
  box-shadow: shadow("card");
  background-clip: padding-box;
}

.input-hint-text {
  margin-left: 0.5em;
  color: $secondary-high;
}

.modal-header {
  display: flex;
  align-items: flex-start;
  padding: 10px 15px;
  border-bottom: 1px solid $primary-low;

  .title {
    h3 {
      margin-bottom: 0;
    }

    p {
      margin: 0;
    }
  }

  .modal-close {
    order: 2;
    margin-left: auto;
  }
}

.modal-backdrop {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: z("modal", "overlay");
  background-color: #111;
  &.fade {
    opacity: 0;
  }
}

.modal-backdrop,
.modal-backdrop.fade.in {
  animation: fade 0.3s;
  opacity: 0.9;
  filter: alpha(opacity=90);
}

// fade in
@keyframes fade {
  from {
    opacity: 0;
  }
  to {
    opacity: 0.9;
  }
}

// slide in
@keyframes slidein {
  from {
    transform: translateY(-20%);
  }
  to {
    transform: translateY(0);
  }
}

.modal-outer-container {
  display: table;
  table-layout: fixed;
  width: 100%;
  height: 100%;
}

.modal-inner-container {
  display: table;
  width: 100%;
  min-width: 320px;
  max-width: 700px;
  margin: 0 auto;
  background-color: $secondary;
  background-clip: padding-box;
  box-shadow: shadow("modal");
  padding: 1px;

  @media screen and (min-width: 475px) {
    min-width: 475px;
    width: auto;
  }

  .select-kit {
    width: 220px;

    &.tag-chooser {
      width: 100%;
    }
  }
}

.create-account.in .modal-inner-container,
.login-modal.in .modal-inner-container {
  animation: slidein 0.3s;
}

.inline-modal {
  .modal-inner-container {
    border: 1px solid $secondary-medium;
  }
}

.fixed-modal {
  position: fixed;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: z("modal", "content");
  overflow: auto;
  &:not(.history-modal) {
    .modal-body {
      max-height: none !important;
    }
  }
}

.modal-form {
  margin-bottom: 0;
}
.modal-footer {
  padding: 14px 15px 10px;
  border-top: 1px solid $primary-low;
  .btn {
    margin: 0 5px 5px 0;
  }
}
.modal-footer:before,
.modal-footer:after {
  display: table;
  content: "";
}
.modal-footer:after {
  clear: both;
}

.modal.edit-category-modal {
  .modal-body {
    textarea {
      height: 10em;
    }
  }
  @media screen and (min-width: 524px) {
    .modal-inner-container {
      min-width: 525px;
    }
  }
}

.modal {
  .nav {
    padding: 10px 30px 10px 15px;
    background-color: $secondary;
    li > a {
      font-size: $font-0;
    }
    border-bottom: 1px solid $primary-low;
  }

  &.hidden {
    display: none;
  }

  .modal-body {
    box-sizing: border-box;
    width: 100%;
    overflow-y: auto;
    max-height: 400px;
    &.full-height-modal {
      max-height: calc(100vh - 150px);
    }
    textarea {
      width: 99%;
      height: 80px;
    }
    p {
      font-size: $font-0;
    }
    .archetype-option {
      margin-bottom: 20px;
    }
    .warning {
      color: $danger !important;
    }
    .json-uploader {
      .jsfu-shade-container {
        display: table-row;
        width: 100%;
        height: 100%;
        position: relative;
      }
      .jsfu-shade {
        z-index: z("base");
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        .text {
          color: rgb(255, 255, 255);
          position: absolute;
          top: 40%;
          font-size: $font-up-6;
          text-align: center;
          line-height: $line-height-medium;
          margin-left: auto;
          margin-right: auto;
          left: 0;
          right: 0;
        }
      }
      .jsfu-file {
        display: table-cell;
        vertical-align: middle;
        min-width: 120px;
      }
      .jsfu-separator {
        vertical-align: middle;
        display: table-cell;
        font-size: 2.571em;
        padding-left: 10px;
        padding-right: 10px;
      }
      .jsfu-paste {
        display: table-cell;
        width: 100%;
        textarea {
          margin-bottom: 0;
          margin-top: 4px;
        }
      }
    }
  }
  .password-confirmation {
    display: none;
  }

  section.field {
    padding: 0.25em 0;
    margin-bottom: 5px;
  }

  section.field .field-item {
    display: inline-block;
    margin-right: 10px;
  }

  // password reset modal
  .modal-body.forgot-password-modal p {
    font-size: $font-0;
  }

  pre code {
    white-space: pre-wrap;
    max-width: 700px;
  }
}

.reply-where-modal {
  .modal-footer {
    a {
      display: block;
    }
    .d-modal-cancel {
      margin-top: 1em;
    }
    .btn {
      text-align: left;
      font-size: $font-up-2;
      line-height: $line-height-medium;
      width: auto;
      margin-bottom: 10px;
      display: block;
      margin-left: 0 !important; // override needed
      font-weight: bold;
      .topic-title {
        font-size: $font-0;
        font-weight: normal;
      }
      &.btn-reply-here {
        background: $primary-low;
        text-shadow: none;
        color: $primary;
      }
    }
  }
}
.d-modal-cancel {
  margin-left: 1em;
  color: $primary-medium;
}

.delete-user-modal {
  .modal-footer {
    .btn {
      font-weight: normal;
      text-align: left;
      font-size: $font-0;
      line-height: $line-height-large;
      margin-bottom: 10px;
      display: inline-block;
      margin-left: 0;
    }
  }
}

.delete-posts-progress {
  .progress-bar {
    height: 15px;
    position: relative;
    background: $primary-low-mid;
    border-radius: 25px;
    overflow: hidden;
    margin: 30px 0 20px;
    span {
      display: block;
      width: 0%;
      height: 100%;
      background-color: $tertiary;
      position: relative;
      transition: width 0.6s linear;
    }
  }
}

#invite-modal {
  overflow: visible;

  label {
    margin-top: 7px;
    max-width: 450px;
  }

  .optional {
    color: #9e9ea6;
  }
}

.permission-list {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  .name {
    margin-right: 20px;
    display: inline-block;
    min-width: 100px;
  }
  .permission {
    margin-left: 20px;
  }
  .d-icon-times-circle {
    margin-left: 5px;
  }
  li {
    margin-bottom: 10px;
  }
}

.edit-category-modal {
  input:not([type="checkbox"]),
  .controls {
    display: block;
    margin-bottom: 0.5em;
  }

  .subcategory-list-style-field {
    margin-left: 16px;
  }

  .disable_info_wrap {
    position: relative;
    display: inline-block;
    float: right;

    .cannot_delete_reason {
      position: absolute;
      background: $primary;
      color: $secondary;
      text-align: center;
      border-radius: 2px;
      padding: 12px 8px;

      &::after {
        top: 100%;
        left: 57%;
        border: solid transparent;
        content: " ";
        position: absolute;
        border-top-color: $primary;
        border-width: 8px;
      }
    }
  }

  section.minimum-required-tags {
    input[type="number"] {
      width: 5em;
    }
  }

  .add-permission {
    margin-top: 12px;
  }
}

.incoming-email-modal {
  .btn {
    transition: none;
    background-color: transparent;
    margin-right: 5px;
    &:hover,
    &.active {
      color: $primary;
    }
    &.active {
      font-weight: bold;
    }
    &:focus {
      outline: 2px solid $primary-low;
    }
  }
  .incoming-email-tabs {
    margin-bottom: 15px;
  }
  .incoming-email-content {
    height: 300px;
    max-width: 700px;
    width: 90vw; // forcing textarea wider
    textarea,
    .incoming-email-html-part {
      height: 95%;
      border: none;
      border-top: 1px solid $primary-low;
      padding-top: 10px;
    }
    textarea {
      font-family: monospace;
      resize: none;
      border-radius: 0;
      box-shadow: none;
    }
    .incoming-email-html-part {
      padding: 10px 4px 4px 4px;
    }
  }
}

.modal-button-bar {
  margin-top: 1em;

  button {
    margin-right: 0.5em;
  }
}

.change-timestamp,
.poll-ui-builder {
  .date-picker {
    min-width: 8em;
  }

  #date-container {
    .pika-single {
      position: relative !important; // overriding another important
      display: inline-block;
      margin-top: 5px;
    }
  }

  input[type="time"] {
    width: 7em;
    text-align: center;
  }

  form {
    margin: 0;
  }
}

.flag-modal {
  max-height: 450px;
  .flag-action-type-details {
    width: 100%;
    line-height: $line-height-large;
  }
}

.flag-message {
  width: 95% !important;
  margin: 0;
}

.custom-message-length {
  color: dark-light-choose($primary-low-mid, $secondary-high);
  font-size: $font-down-1;
}

.edit-category-modal {
  .secure-category-options {
    margin: 10px 0 0 16px;
    .badge-list {
      margin: 10px 0;
      li {
        margin: 0 4px 8px 0;
        a {
          color: dark-light-choose($primary-medium, $secondary-medium);
          cursor: pointer;
        }
        a:hover {
          color: dark-light-choose($primary-medium, $secondary-medium);
        }
      }
    }
  }
}

.jump-to-post-modal {
  .modal-body {
    #post-jump,
    .date-picker {
      margin: 0;
      width: 100px;
    }

    .pika-single {
      position: relative !important;
    }

    .jump-to-post-control .index {
      color: $primary-medium;
    }

    .separator {
      display: flex;
      align-items: center;
      margin: 1em auto;

      .left,
      .right {
        flex: 1 0 0;
      }

      .text {
        margin: 0 0.5em;
        color: $primary-medium;
      }
    }
  }
}

// split topic modal
.split-modal {
  // move to existing topic
  .existing-topic {
    .radio {
      flex-wrap: wrap;
    }
    .topic-title {
      max-width: 90%;
    }
    .topic-categories {
      width: 100%;
      margin-left: 5px;
    }
  }
}

.tabbed-modal {
  .modal-body {
    position: relative;
    height: 350px;
  }
}

.modal-tab {
  position: absolute;
  width: 95%;
}