metamask-extension/ui/app/components/ui/popover/index.scss

.popover {
  &-wrap {
    ::-webkit-scrollbar {
      width: 6px;
    }

    ::-webkit-scrollbar-thumb {
      -webkit-border-radius: 10px;
      border-radius: 10px;
      background: #C4C4C4;
    }

    display: flex;
    flex-direction: column;
    position: absolute;
    width: 328px;
    max-height: 94vh;

    box-shadow: 0px 4px 30px rgba(0, 0, 0, 0.25);
    border-radius: 10px;
    background: white;
  }

  &-header {
    display: flex;
    padding: 24px;
    flex-direction: column;
    background: white;
    position: relative;
    border-radius: 10px;

    &__title {
      display: flex;
      align-items: center;
      justify-content: space-between;

      @extend %font;
      font-weight: bold;
      font-size: 18px;
      line-height: 25px;
      padding-bottom: 8px;

      h2 {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;

        button {
          margin-right: 24px;
        }
      }
    }

    &__subtitle {
      @extend %font;
      font-weight: normal;
      font-size: 14px;
      line-height: 20px;
    }

    &__button {
      background: none;
      font-size: inherit;
      padding: 0;
    }

    i {
      cursor: pointer;
    }
  }

  &-bg {
    width: 100%;
    height: 100%;
    background: black;
    opacity: 20%;
  }

  &-content {
    overflow-y: auto;
    position: relative;
    display: flex;
    flex: 1;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    align-content: stretch;
  }

  &-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1050;
  }

  &-footer {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    border-top: 1px solid #D2D8DD;
    padding: 16px 24px 24px;

    & :only-child {
      margin: 0 auto;
    }
  }

  &-arrow {
    width: 22px;
    height: 22px;
    background: white;
    position: absolute;
    transform: rotate(45deg);
    box-shadow: 0px 4px 30px rgba(0, 0, 0, 0.25);
  }
}