discourse/app/assets/stylesheets/common/admin/admin_emojis.scss

.admin-emojis {
  #custom_emoji {
    .select-kit {
      width: 220px;
    }
  }

  .emoji-uploader {
    display: flex;
    align-items: flex-end;

    input,
    .select-kit {
      width: 220px;
      margin: 0 1em 0 0;
    }

    .upload-container {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-direction: column;
    }
  }
}