mdb-ui-kit/scss/_lists.scss

.list-group {
  border-radius: 0;
  .list-group-item {
    padding: 0 16px;
    overflow: hidden;
    background-color: transparent;
    border: 0;
    border-radius: 0;
    &.baseline {
      border-bottom: 1px solid #cecece;
      &:last-child {
        border-bottom: 0;
      }
    }
    .row-picture, .row-action-primary {
      //float: left; WARNING: float can't be used with display: inline-block. Certain properties shouldn't be used with certain display property values. (display-property-grouping) Browsers: All
      display: inline-block;
      padding-right: 16px;
      img, i, label {
        display: block;
        width: 56px;
        height: 56px;
      }
      img {
        padding: 1px;
        background: rgba($black, 0.1);
        &.radio-decorator {
          border-radius: 100%;
        }
      }
      i {
        font-size: 20px;
        line-height: 56px;
        color: $white;
        text-align: center;
        background: rgba($black, 0.25);
        border-radius: 100%;
      }
      label {
        margin: 5px -7px -5px 7px;
        .checkbox-decorator {
          left: -10px;
        }
      }
    }
    .row-content {
      display: inline-block;
      width: unquote("calc(100% - 92px)");
      min-height: 66px;
      .action-secondary {
        position: absolute;
        top: 16px;
        right: 16px;
        i {
          font-size: 20px;
          color: rgba($black, 0.25);
          cursor: pointer;
        }
      }
      .action-secondary ~ * {
        max-width: unquote("calc(100% - 30px)");
      }
      .least-content {
        position: absolute;
        top: 0;
        right: 16px;
        font-size: 14px;
        color: rgba($black, 0.54);
      }
    }
    .list-group-item-heading {
      font-size: 20px;
      line-height: 29px;
      color: rgba($black, 0.77);
    }
  }

  .list-group-item.active {
    &:hover, &:focus {
      background: rgba($black, .15);
      outline: 10px solid rgba($black, .15);
    }
    .list-group-item-heading, .list-group-item-text {
      color: $mdb-text-color-primary;
    }
  }

  .list-group-separator {
    margin-top: 10px;
    margin-bottom: 10px;
    overflow: hidden;
    clear: both;
    &::before {
      float: right;
      width: unquote("calc(100% - 90px)");
      content: "";
      border-bottom: 1px solid rgba($black, 0.1);
    }
  }
}