ant-design/style/mixins/input.less

// size mixins for input
.input-lg() {
  padding: @input-padding-lg;
  height: @input-height-lg;
  font-size: @input-font-size-lg;
}

.input-sm() {
  padding: @input-padding-vertical-sm @input-padding-horizontal;
  height: @input-height-sm;
  font-size: @input-font-size-sm;
}

// Basic style for input
.input() {
  position: relative;
  display: inline-block;
  padding: @input-padding-vertical-base @input-padding-horizontal;
  width: 100%;
  height: @input-height-base;
  cursor: text;
  font-size: @input-font-size;
  line-height: @line-height-base;
  color: @input-color;
  background-color: @input-bg;
  background-image: none;
  border: 1px solid @input-border-color;
  border-radius: @border-radius-base;
  .placeholder(); // Reset placeholder
  .transition(~"border .3s @{ease-in-out}, background .3s @{ease-in-out}, box-shadow .3s @{ease-in-out}");

  &:hover {
    border-color: @input-hover-border-color;
  }

  &:focus {
    border-color: @input-focus-border-color;
    outline: 0;
    box-shadow: 0 0 3px tint(@input-focus-border-color, 20%);
  }

  &[disabled],
  fieldset[disabled] & {
    background-color: @input-disabled-bg;
    opacity: 1;
    &:hover {
      border-color: @input-border-color;
    }
  }

  &[disabled],
  fieldset[disabled] & {
    cursor: @cursor-disabled;
  }

  // Reset height for `textarea`s
  textarea& {
    height: auto;
  }

  // Size
  &-lg {
    .input-lg();
  }

  &-sm {
    .input-sm();
  }
}

// Input with icons, you can define @height if you wish to change the input size
.input-with-icon(@height: @input-height-base) {
  position: relative;

  .@{iconfont-css-prefix} {
    position: absolute;
    bottom: 0;
    right: 0;
    z-index: 2;
    .square(@height);
    font-size: 14px;
    line-height: @height;
    text-align: center;
    pointer-events: none;
  }
}

// label input
.input-group(@inputClass; @btnclass) {
  position: relative;
  display: table;
  border-collapse: separate;

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

  > [class*="col-"] {
    padding-right: 8px;
  }

  &-addon, 
  &-btn, 
  > .@{inputClass} {
    display: table-cell;

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

  &-addon, 
  &-btn {
    width: 1%;
    white-space: nowrap;
    vertical-align: middle;
  }

  .@{inputClass} {
    position: relative;
    z-index: 2;
    float: left;
    width: 100%;
    margin-bottom: 0;
  }

  &-addon {
    padding: @input-padding-vertical-base @input-padding-horizontal;
    font-size: @font-size-base;
    font-weight: normal;
    line-height: 1;
    color: @input-color;
    text-align: center;
    background-color: #eee;
    border: 1px solid @input-border-color;
    border-radius: @border-radius-base;
  }

  .@{btnclass} {
    border-radius: @border-radius-base;
    .button-variant(@input-color; #eee; @input-border-color);
    margin-left: -1px;

    &:hover {
      .button-color(@input-color; tint(#eee, 20%); @input-border-color);
    }
    &:active, &.active {
      .button-color(@input-color; shade(#eee, 5%); @input-border-color);
    }

    .@{iconfont-css-prefix} {
      line-height: 1;
      margin-left: 8px;
    }
  }

  // Reset rounded corners
  > .@{inputClass}:first-child, 
  &-addon:first-child {
    border-bottom-right-radius: 0;
    border-top-right-radius: 0;
  }

  &-addon:first-child {
    border-right: 0;
  }
  &-addon:last-child {
    border-left: 0;
  }

  > .@{inputClass}:last-child,
  &-addon:last-child,
  &-btn .@{btnclass}{
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;
  }

  // Sizing options
  &-lg .@{inputClass},
  &-lg > &-addon,
  &-lg > &-btn .@{btnclass} {
    .input-lg();
  }

  &-sm .@{inputClass},
  &-sm > &-addon,
  &-sm > &-btn .@{btnclass} {
    .input-sm();
  }

  &-sm > &-btn .@{btnclass} {
    margin-top: ~"-2px \9";
  }
}