discourse/app/assets/stylesheets/common/admin/customize-install-theme.scss

.install-theme {
  min-width: 650px;
  display: flex;
}

.install-theme-items {
  width: 200px;
}

.install-theme-item {
  border: 1px solid $primary-low;
  border-bottom: none;
  position: relative;

  &:last-child {
    border-bottom: 1px solid $primary-low;
  }

  input,
  .d-icon-caret-right {
    display: none;
  }

  label {
    display: block;
    padding: 10px 30px 10px 10px;
    margin-bottom: 0px;
    cursor: pointer;
  }

  input:checked + label {
    color: $secondary;
    background-color: $tertiary;
    + .d-icon {
      display: block;
      color: $secondary;
    }
  }

  .d-icon-caret-right {
    position: absolute;
    right: 5px;
    top: 50%;
    margin-top: -7px;
  }
}

.install-theme-content {
  padding: 0px 0px 10px 20px;
  width: calc(100% - 200px);
}

.repo {
  input[type="text"] {
    width: 90%;
  }
}

.popular-theme-items {
  height: 65vh;
  overflow: auto;
  padding-right: 20px;
}

.popular-theme-item {
  border-bottom: 1px solid $primary-low;
  padding: 8px 0px;
  display: flex;
  align-items: center;
  .popular-theme-name {
    flex: 1;
    .popular-theme-type {
      font-weight: normal;
      font-size: $font-down-2;
      color: $primary-medium;
    }

    a {
      color: $primary-very-high;
      font-weight: bold;
      &:hover,
      &:visited,
      &:active {
        color: $primary-high;
      }
    }

    .popular-theme-description {
      font-size: $font-down-1;
      padding-right: 20px;
    }
  }
  .popular-theme-buttons {
    > span {
      font-style: italic;
      font-size: $font-down-1;
      color: $primary-medium;
      margin-right: 8px;
    }

    > a {
      display: block;
      font-size: $font-down-2;
      margin-top: 5px;
      text-align: center;
    }
  }
}