metamask-extension/ui/app/css/itcss/components/token-list.scss

$wallet-balance-breakpoint: 890px;
$wallet-balance-breakpoint-range: "screen and (min-width: #{$break-large}) and (max-width: #{$wallet-balance-breakpoint})";

.token-list-item {
  display: flex;
  flex-flow: row nowrap;
  align-items: center;
  padding: 20px 24px;
  cursor: pointer;
  transition: linear 200ms;
  background-color: rgba($wallet-balance-bg, 0);

  &__token-balance {
    font-size: 130%;

    @media #{$wallet-balance-breakpoint-range} {
      font-size: 105%;
    }
  }

  &__fiat-amount {
    margin-top: .25%;
    font-size: 105%;

    @media #{$wallet-balance-breakpoint-range} {
      font-size: 95%;
    }
  }

  @media #{$wallet-balance-breakpoint-range} {
    padding: 10% 4%;
  }

  &--active {
    background-color: rgba($wallet-balance-bg, 1);
  }

  &__identicon {
    margin-right: 15px;
    border: '1px solid #dedede';

    @media #{$wallet-balance-breakpoint-range} {
      margin-right: 4%;
    }
  }
}