discourse/app/assets/stylesheets/common/components/bookmark-modal.scss

.bookmark-with-reminder.modal {
  .modal-inner-container {
    max-width: 95%;
  }
  .modal-body {
    max-width: 410px;
    width: 100%;
    box-sizing: border-box;

    .control-label {
      font-weight: 700;
    }

    .ember-text-field.bookmark-name {
      width: 100%;
    }
  }

  .custom-date-time-wrap {
    display: flex;
    flex-direction: row;
    align-items: baseline;

    .svg-icon {
      padding: 0 5px;
    }

    .date-picker-wrapper {
      flex: 1;

      .date-picker {
        width: 100%;
      }
    }

    .time-input {
      flex: 1;
    }
  }
}