assistant-storefront/app/assets/stylesheets/administrate/base/_tables.scss

table {
  border-collapse: collapse;
  font-size: $font-size-default;
  text-align: left;
  width: 100%;

  a {
    color: inherit;
    text-decoration: none;
  }
}

tr {
  border-bottom: $base-border;

  th {
    font-weight: $font-weight-medium;

    &.cell-label--avatar-field {
      a {
        display: none;
      }
    }
  }
}

tbody tr {
  &:hover {
    background-color: $base-background-color;
    cursor: pointer;
  }

  &:focus {
    outline: $focus-outline;
    outline-offset: -($focus-outline-width);
  }

  td {
    &.cell-data--avatar-field {
      line-height: 1;
      text-align: center;

      img {
        border-radius: 50%;
        height: $space-large;
        max-height: $space-large;
        width: $space-large;
      }
    }
  }
}

td,
th {
  padding: $space-slab;
  vertical-align: middle;
}

td:first-child,
th:first-child {
  padding-left: 0;
}

td:last-child,
th:last-child {
  padding-right: 0;
}

td img {
  max-height: 2rem;
}