metamask-extension/ui/app/pages/swaps/dropdown-input-pair/index.scss

.dropdown-input-pair {
  display: flex;
  width: 312px;
  height: 60px;
  position: relative;

  &__input {
    margin: 0 !important;

    input {
      @include H4;

      padding-top: 6px;
    }

    div {
      border: 1px solid $Grey-100;
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
      border-left: none;
      height: 60px;
    }

    input::-webkit-outer-spin-button,
    input::-webkit-inner-spin-button {
      /* display: none; <- Crashes Chrome on hover */
      -webkit-appearance: none;
      margin: 0; /* <-- Apparently some margin are still there even though it's hidden */
    }

    input[type=number] {
      -moz-appearance: textfield; /* Firefox */
    }
  }

  &__list {
    &--full-width {
      width: 100%;
    }
  }

  &__left-value {
    @include H7;

    position: absolute;
    right: 16px;
    height: 100%;
    display: flex;
    align-items: center;
    color: $Grey-500;

    &--two-lines {
      right: inherit;
      left: 157px;
      align-items: unset;
      top: 34px;
    }
  }

  .dropdown-input-pair__selector--closed {
    height: 60px;
    width: 142px;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
  }

  &__two-line-input {
    div {
      align-items: flex-start;
    }

    input {
      padding-top: 14px;
    }
  }
}