metamask-extension/ui/app/components/sidebars/sidebar-content.scss

.sidebar-left {
  display: flex;

  .gas-modal-page-container {
    display: flex;

    .page-container {
      flex: 1;
      max-width: 100%;

      &__content {
        display: flex;
        overflow-y: initial;
      }

      @media screen and (max-width: $break-small) {
        max-width: 344px;
        min-height: auto;
      }

      @media screen and (min-width: $break-small) {
        max-height: none;
      }
    }

    .gas-price-chart {
      margin-left: 10px;

      &__root {
        max-height: 160px !important;
      }
    }

    .page-container__bottom {
      display: flex;
      flex-direction: column;
      flex-flow: space-between;
      height: 100%;
    }

    .page-container__content {
      overflow-y: inherit;
    }

    .basic-tab-content {
      height: auto;
      margin-bottom: 0px;
      border-bottom: 1px solid #d2d8dd;
      flex: 1 1 70%;

      @media screen and (max-width: $break-small) {
        padding-left: 14px;
        padding-bottom: 21px;
      }

      .gas-price-button-group--alt {
        @media screen and (max-width: $break-small) {
          max-width: 318px;

          &__time-estimate {
            font-size: 12px;
          }
        }
      }
    }

    .advanced-tab {
      @media screen and (min-width: $break-small) {
        flex: 1 1 70%;
      }

      &__fee-chart {
        height: 320px;

        @media screen and (max-width: $break-small) {
          height: initial;
        }
      }

      &__fee-chart__speed-buttons {
        bottom: 77px;

        @media screen and (max-width: $break-small) {
          display: none;
        }
      }
    }

    .gas-modal-content {
      display: flex;
      flex-direction: column;
      width: 100%;

      &__info-row-wrapper {
        display: flex;
        @media screen and (min-width: $break-small) {
          flex: 1 1 30%;
        }
      }

      &__info-row {
        height: 170px;

        @media screen and (max-width: $break-small) {
          height: initial;
          display: flex;
          justify-content: center;
        }
      }
    }
  }
}