discourse/app/assets/stylesheets/mobile/compose.scss

.composer-popup-container {
  display: none !important; // can be removed if inline JS CSS is removed from composer-popup
}

.composer-popup {
  display: none !important; // can be removed if inline JS CSS is removed from composer-popup
}

#reply-control {
  z-index: z("mobile-composer");
  .reply-area {
    padding: 0 10px;
    @media screen and (max-width: 374px) {
      padding: 0 5px;
    }
    flex-grow: 1;
  }

  &.open {
    height: 250px;
    &.edit-title {
      height: 100%;
    }
  }

  .reply-to {
    margin: 5px 0;
  }

  .toggler {
    margin-left: -5px;
    .d-icon-chevron-down {
      vertical-align: text-top;
    }
  }

  &.draft {
    .toggle-toolbar,
    .toggler {
      top: 8px;
    }
    .draft-text {
      width: calc(100% - 40px);
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }

  #reply-title {
    width: calc(100% - 20px);
  }

  .category-input {
    margin-bottom: 5px;
    .category-chooser {
      width: 100% !important;
    }
  }

  .submit-panel {
    margin-bottom: 5px;
    align-items: baseline;
    .save-or-cancel {
      flex: 1 1 auto;
      #draft-status,
      #file-uploading {
        margin-left: 15px;
      }
      .cancel {
        font-size: 1.6em;
        color: $primary-low-mid;
        margin-left: 0.6em;
        padding: 0 5px;
      }
    }
    .composer-bottom-right {
      margin-left: auto;
      flex: 1 1 auto;
    }
  }

  .d-editor-textarea-wrapper {
    width: 100%;
  }

  &.show-preview {
    .d-editor-preview-wrapper {
      position: fixed;
      z-index: z("base") + 1;
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
      background-color: $secondary;
      max-width: 100%;
      margin: 0;
      padding: 10px;
      overflow: auto;
      .d-editor-preview {
        margin-bottom: 40px;
      }
    }
    .btn.hide-preview {
      position: fixed;
      right: 5px;
      bottom: 5px;
      z-index: z("base") + 2;
    }
  }

  &.hide-preview {
    .d-editor-preview-wrapper {
      display: none;
    }
  }

  .d-editor-button-bar {
    display: none;
  }

  .toolbar-visible .d-editor-button-bar {
    display: flex;
  }

  .d-editor-button-bar .btn {
    @media all and (max-width: 350px) {
      padding: 2px 4px;
    }
    &.preview {
      margin: 0;
    }
  }

  #mobile-uploader {
    display: none;
  }

  .title-and-category,
  .user-selector {
    margin: 0;
    .users-input {
      margin-bottom: 5px;
    }
  }

  .title-input,
  .category-input,
  .users-input,
  .add-warning {
    width: 100%;
  }

  .add-warning {
    margin: 0 0 5px 5px;
  }
}