v1.14.6/ui/app/styles/core/field.scss

/**
 * Copyright (c) HashiCorp, Inc.
 * SPDX-License-Identifier: MPL-2.0
 */

// This file defines the styles for .field, .field-body, .form-fieldset

.field {
  // cannot use :read-only selector because tag used for other purposes
  &.is-readOnly {
    background-color: $ui-gray-100;
    cursor: not-allowed;
  }

  &:not(:last-child) {
    margin-bottom: $size-4;
  }
}
// must come after field due to overriding the margin-bottom of not last-child
.field-body .field {
  margin-bottom: 0;
}

.field.has-addons {
  flex-wrap: wrap;
  .control {
    .button,
    .checkbox,
    .input,
    .select select {
      border-radius: 0;
      &:hover {
        z-index: 2;
      }
      &:focus,
      &:active,
      &.is-active {
        z-index: 3;
        &:hover {
          z-index: 4;
        }
      }
    }
    &:first-of-type {
      flex-grow: 1;
      .button,
      .checkbox,
      .input,
      .select select {
        border-bottom-left-radius: $radius;
        border-top-left-radius: $radius;
      }
    }
    &:last-child {
      .button,
      .checkbox,
      .input,
      .select select {
        border-bottom-right-radius: $radius;
        border-top-right-radius: $radius;
      }
    }
  }
  & > .label {
    flex-grow: 1;
    flex-shrink: 0;
    width: 100%;
  }
}

fieldset.form-fieldset {
  border: none;
}

// field.is-grouped styles
.field.is-grouped {
  display: flex;
  justify-content: flex-start;

  > .control.is-expanded {
    flex-grow: 1;
    flex-shrink: 1;
  }

  > .control {
    flex-shrink: 0;
  }

  > .control:not(:last-child) {
    margin-bottom: 0;
    margin-right: 0.75rem;
  }

  > .control.is-expanded {
    flex-grow: 1;
    flex-shrink: 1;
  }
}

// responsive css
@media screen and (min-width: 769px), print {
  .field.is-horizontal {
    display: flex;
  }

  .field-body {
    display: flex;
    flex-basis: 0;
    flex-grow: 5;
    flex-shrink: 1;

    > .field:not(:last-child) {
      margin-right: $size-9;
    }
    .field:not(.is-narrow) {
      flex-grow: 1;
    }
  }

  .field-label {
    flex-basis: 0;
    flex-grow: 1;
    flex-shrink: 0;
    margin-right: 1.5rem;
    text-align: right;

    &.is-normal {
      padding-top: 0.375em;
    }

    &.is-medium {
      font-size: 1.25rem;
      padding-top: 0.375em;
    }

    &.is-large {
      font-size: 1.5rem;
      padding-top: 0.375em;
    }
  }
}