metamask-extension/ui/app/pages/swaps/slippage-buttons/index.scss

.slippage-buttons {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;

  &__header {
    display: flex;
    align-items: center;
    margin-bottom: 0;
    margin-left: auto;
    margin-right: auto;
    cursor: pointer;
    background: unset;
    margin-bottom: 8px;
  }

  &__header-text {
    @include H6;

    margin-right: 6px;
    font-weight: 900;
  }

  &__content {
    padding-left: 10px;
  }

  &__dropdown-content {
    display: flex;
    align-items: center;
  }

  &__buttons-prefix {
    display: flex;
    align-items: center;
    margin-right: 8px;
  }

  &__prefix-text {
    @include H6;

    margin-right: 4px;
    color: black;
    font-weight: 900;
  }

  &__error-text {
    @include H7;

    color: $Red-500;
    margin-top: 8px;
  }

  &__button-group {
    & &-custom-button {
      cursor: text;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      min-width: 72px;
      margin-right: 0;
    }
  }

  &__custom-input {
    display: flex;
    justify-content: center;

    input {
      border: none;
      width: 64px;
      text-align: center;
      background: $Blue-500;
      color: white;
      font-weight: inherit;

      &::-webkit-input-placeholder { /* WebKit, Blink, Edge */
        color: white;
      }

      &:-moz-placeholder { /* Mozilla Firefox 4 to 18 */
        color: white;
        opacity: 1;
      }

      &::-moz-placeholder { /* Mozilla Firefox 19+ */
        color: white;
        opacity: 1;
      }

      &:-ms-input-placeholder { /* Internet Explorer 10-11 */
        color: white;
      }

      &::-ms-input-placeholder { /* Microsoft Edge */
        color: white;
      }

      &::placeholder { /* Most modern browsers support this now. */
        color: white;
      }
    }

    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;
    }

    &--danger {
      input {
        background: $Red-500;
      }
    }
  }

  &__percentage-suffix {
    position: absolute;
    right: 5px;
  }
}