metamask-extension/ui/app/components/ui/unit-input/index.scss

.unit-input {
  @include Paragraph;

  display: flex;
  flex-flow: row nowrap;
  align-items: center;
  min-height: 54px;
  border: 1px solid #dedede;
  border-radius: 4px;
  background-color: #fff;
  color: #4d4d4d;
  padding: 8px 10px;
  position: relative;

  input[type="number"] {
    -moz-appearance: textfield;
  }

  input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    -moz-appearance: none;
    display: none;
  }

  input[type="number"]:hover::-webkit-inner-spin-button {
    -webkit-appearance: none;
    -moz-appearance: none;
    display: none;
  }

  &__inputs {
    flex: 1 0 auto;
    display: flex;
    flex-flow: column nowrap;
  }

  &__input {
    @include Paragraph;

    color: #4d4d4d;
    border: none;
    max-width: 15ch;
    overflow: hidden;
    text-overflow: ellipsis;
    height: 16px;

    &__disabled {
      background-color: rgb(222, 222, 222);
    }
  }

  &__input-container {
    display: flex;
    align-items: center;
    padding-bottom: 2px;
  }

  &__suffix {
    @include Paragraph;

    margin-left: 3px;
  }

  &--error {
    border-color: $red;
  }

  &__disabled {
    background-color: #f2f3f4;
  }
}