web/assets/css/less/bootstrap/input-groups.less

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//
// Input groups
// --------------------------------------------------

// Base styles
// -------------------------
.input-group {
  position: relative; // For dropdowns
  display: table;
  border-collapse: separate; // prevent input groups from inheriting border styles from table cells when placed within a table

  // Undo padding and float of grid classes
  &[class*="col-"] {
    float: none;
    padding-left: 0;
    padding-right: 0;
  }

  .form-control {
    // Ensure that the input is always above the *appended* addon button for
    // proper border colors.
    position: relative;
    z-index: 2;

    // IE9 fubars the placeholder attribute in text inputs and the arrows on
    // select elements in input groups. To fix it, we float the input. Details:
    // https://github.com/twbs/bootstrap/issues/11561#issuecomment-28936855
    float: left;

    width: 100%;
    margin-bottom: 0;
  }
}

// Sizing options
//
// Remix the default form control sizing classes into new ones for easier
// manipulation.

.input-group-lg > .form-control,
.input-group-lg > .input-group-addon,
.input-group-lg > .input-group-btn > .btn {
  .input-lg();
}
.input-group-sm > .form-control,
.input-group-sm > .input-group-addon,
.input-group-sm > .input-group-btn > .btn {
  .input-sm();
}


// Display as table-cell
// -------------------------
.input-group-addon,
.input-group-btn,
.input-group .form-control {
  display: table-cell;

  &:not(:first-child):not(:last-child) {
    border-radius: 0;