MyCrypto/common/sass/styles/overrides/react-select.scss

// This syntax is necessary to override css styles in react-select
.Select {
  font-size: 1rem;
  .Select-control {
    height: $input-height-base;
    display: block;
    box-sizing: border-box;
    font-weight: 400;
    border-radius: 0px;
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
    border: 1px solid $input-border;
    transition: $transition;
    &:hover {
      box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
      border: 1px solid $input-border;
    }
    .Select-value {
      padding-left: $input-padding-x;
      padding-right: $input-padding-x;
      .Select-value-label {
        vertical-align: middle;
      }
    }
    .Select-arrow-zone {
      float: right;
      position: relative;
      top: 50%;
      transform: translateY(-50%);
    }
  }
  .Select-menu-outer {
    box-sizing: content-box;
    font-weight: 400;
    border: 1px solid $input-border;
    width: calc(100% - 1px);
  }
  .Select-placeholder {
    color: #d3d3d3;
    padding: 0px $input-padding-x;
    line-height: $input-height-base;
  }
  .Select-input {
    opacity: 0;
  }
  &.is-open {
    .Select-control {
      border: 1px solid $input-border;
    }
  }
  &.is-focused {
    &:not(.is-open):not(.is-invalid) {
      .Select-control {
        border-color: $brand-primary;
        box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 1px rgba(14, 151, 192, 0.5);
      }
    }
  }

  @mixin react-select-control-state($color) {
    .Select-control {
      border-color: lighten($color, 20%);
      @include input-shadow($color);
    }
    .Select-menu-outer {
      border-color: lighten($color, 20%);
      @include input-shadow($color);
    }

    &.is-focused {
      .Select-control {
        border-color: lighten($color, 5%);
        @include input-focus-shadow($color);
      }
      .Select-menu-outer {
        border-color: lighten($color, 5%);
        @include input-focus-shadow($color);
      }
    }
  }

  &.is-valid {
    @include react-select-control-state($brand-success);
  }

  &.is-invalid {
    @include react-select-control-state($brand-danger);
  }

  &.is-warning {
    @include react-select-control-state($brand-warning);
  }
}