discourse/app/assets/stylesheets/common/base/edit-topic-status-update-modal.scss

.edit-topic-timer-modal {
  .modal-body {
    max-height: none;
  }

  .select-kit {
    width: 50%;
  }

  input.date-picker,
  input[type="time"] {
    width: 150px;
    text-align: left;
  }

  .radios {
    margin-bottom: 10px;
  }

  label {
    vertical-align: middle;
    display: inline-block;
    padding-right: 5px;

    input {
      vertical-align: middle;
    }
  }

  .btn.pull-right {
    margin-right: 10px;
  }

  .future-date-input {
    input {
      margin: 0;
    }

    .alert-info {
      margin: 0 -15px -15px -15px;
    }

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

    .topic-status-info {
      border: none;
      padding: 0;

      h3 {
        font-weight: normal;
        font-size: $font-up-1;
      }
    }
  }
}

// mobile styles
.mobile-view .edit-topic-timer-modal {
  .control-group {
    display: flex;
    align-items: center;

    > .d-icon {
      margin-right: 5px;
    }
  }

  .select-kit.combo-box {
    flex: 1;
  }

  .future-date-input-selector-header .btn-clear {
    display: none;
  }

  .modal-body {
    overflow: visible !important; /* inline styles from JS */
  }

  .pika-single {
    position: absolute !important; /* inline styles from JS */
  }
}