framework/less/forum/NotificationGrid.less

.NotificationGrid {
  background: @control-bg;
  border-radius: @border-radius;

  td, th {
    border-bottom: 1px solid @body-bg;
    color: @control-color;
  }
  td, th, .Checkbox {
    padding: 10px 15px;
  }
  .NotificationGrid-checkbox {
    padding: 0;
  }
  thead {
    th {
      text-align: center;
      padding: 15px 25px;
    }
    .icon {
      display: block;
      font-size: 14px;
      width: auto;
      margin-bottom: 5px;
    }
  }
}
.NotificationGrid-groupToggle {
  cursor: pointer;

  .icon {
    font-size: 14px;
    margin-right: 2px;
  }
}
.NotificationGrid-checkbox {
  .Checkbox {
    display: block;
  }
  .Checkbox-display {
    text-align: center;
    cursor: pointer;
  }
  &.highlighted .Checkbox, .Checkbox:hover {
    &:not(.disabled) {
      background: darken(@control-bg, 4%);
    }
  }
}