amis/scss/components/_search-box.scss

.#{$ns}SearchBox {
  display: inline-flex;
  flex-direction: row;

  line-height: $Form-input-lineHeight;
  font-size: $Form-input-fontSize;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;

  height: 30px;
  width: 30px;
  padding: 0 8px;

  transition: all 0.3s ease-in-out;
  border: $Form-input-borderWidth solid transparent;
  border-radius: $Form-input-borderRadius;

  &:hover {
    background-color: rgba($Form-input-bg, 0.6);
  }

  &.is-active {
    background-color: $Form-input-bg;
    border: $Form-input-borderWidth solid $Form-input-borderColor;
    width: 150px;
    > input {
      flex-grow: 1;
    }
  }

  &-activeBtn,
  &-cancelBtn {
    cursor: pointer;
    color: $icon-color;

    &:hover {
      color: $icon-onHover-color;
    }
  }

  > input {
    outline: none;
    border: none;
    background: transparent;
    color: $Form-input-color;

    width: 0;
    height: $Form-input-lineHeight * $Form-input-fontSize;

    &::placeholder {
      color: $Form-input-placeholderColor;
      user-select: none;
    }
  }

  height: 30px;
}