MyJavawebProject/WebContent/scss/bootstrap/_input-group.scss

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// stylelint-disable selector-no-qualifying-type

//
// Base styles
//

.input-group {
  position: relative;
  display: flex;
  flex-wrap: wrap; // For form validation feedback
  align-items: stretch;
  width: 100%;

  > .form-control,
  > .custom-select,
  > .custom-file {
    position: relative; // For focus state's z-index
    flex: 1 1 auto;
    // Add width 1% and flex-basis auto to ensure that button will not wrap out
    // the column. Applies to IE Edge+ and Firefox. Chrome does not require this.
    width: 1%;
    margin-bottom: 0;

    // Bring the "active" form control to the top of surrounding elements
    &:focus {
      z-index: 3;
    }

    + .form-control,
    + .custom-select,
    + .custom-file {
      margin-left: -$input-border-width;
    }
  }

  > .form-control,
  > .custom-select {
    &:not(:last-child) { @include border-right-radius(0); }
    &:not(:first-child) { @include border-left-radius(0); }
  }

  // Custom file inputs have more complex markup, thus requiring different
  // border-radius overrides.
  > .custom-file {
    display: flex;
    align-items: center;

    &:not(:last-child) .custom-file-label,
    &:not(:last-child) .custom-file-label::before { @include border-right-radius(0); }
    &:not(:first-child) .custom-file-label,
    &:not(:first-child) .custom-file-label::before { @include border-left-radius(0); }
  }
}


// Prepend and append
//
// While it requires one extra layer of HTML for each, dedicated prepend and
// append elements allow us to 1) be less clever, 2) simplify our selectors, and
// 3) support HTML5 form validation.