Bootstrap class: .input-group

<div class="input-group">
  <div class="input-group-prepend">
    <span class="input-group-text">Left addon</span>
  </div>
  <input type="text" class="form-control">
  <div class="input-group-append">
    <span class="input-group-text">Right addon</span>
  </div>
</div>

Preview

Left addon

Right addon

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Sass source

/* _button-group.scss:41 */
.input-group {
  width: auto;
}

/* _input-group.scss:7 */
.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;

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

  // Bring the "active" form control to the top of surrounding elements
  > .form-control:focus,
  > .custom-select:focus,
  > .custom-file .custom-file-input:focus ~ .custom-file-label {
    z-index: 3;
  }

  // Bring the custom file input above the label
  > .custom-file .custom-file-input:focus {
    z-index: 4;
  }

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

/* _input-group.scss:162 */
.input-group > .input-group-append:last-child > .input-group-text:not(:last-child) {
  @include border-right-radius(0);
}

/* _input-group.scss:171 */
.input-group > .input-group-prepend:first-child > .input-group-text:not(:first-child) {
  @include border-left-radius(0);
}

Uses variables

/* _button-group.scss:41 */


/* _input-group.scss:7 */
$input-border-width

/* _input-group.scss:162 */


/* _input-group.scss:171 */