discourse/plugins/poll/assets/stylesheets/common/poll-ui-builder.scss

.poll-ui-builder-form {
  margin: 0;

  .input-group {
    padding: 10px;
  }

  label {
    font-weight: bold;
    display: inline;
  }

  .input-group-label {
    display: inline-block;
    width: 45px;
  }

  .combobox {
    margin-right: 5px;
  }

  .poll-options-min, .poll-options-max, .poll-options-step {
    width: 70px !important;
  }
}