.user-center {
  margin-top: 50px;
  color: #333;
  line-height: 20px;
  text-align: justify;
  a {
    text-decoration: none;
    color: #333;
  }
  a:hover {
    cursor: pointer;
    text-decoration: none;
  }

  .list-unstyled {
    li {
      padding: 7px 12px;
      border-radius:5px;
      // float:left;
    }
    li:hover {
      background-color: #1f1f1f;
      text-decoration: none;
      color: #f9f9f9;
      // filter:alpha(Opacity=100);
      // -moz-opacity:0.8;
      // transition: 0.4s;
      // border-radius:5px;
    }
  }

  .label-title {
    margin-bottom: -8px;
  }

  .twitters-li {
    margin-bottom: 20px;
    .twitter-box {
      padding: 15px 15px 10px;
      background-color: #f8f8f8;
      .twitter-content {
        margin-bottom: 10px;
      }
      span {
        color: #999
      }
    }

    // collapse 和 collapsing 会是一个连贯的动画效果, 样式保持一致
    .collapse {
      .twitter-edit-destroy {
        padding: 0 15px 10px;
        background-color: #f8f8f8;
        a {
          color: #999
        }
        a:hover {
          color: #333
        }
      }
      .card-body {
        padding: 15px 15px 10px;
        background-color: #f0f0f0;
        .review-box {
          padding: 15px 0 10px;
          img {
            width: 40px;
            height: 40px;
          }
          .media-heading {
            font-weight: bold;
            span {
              font-weight: normal;
              color: #999;
            }
          }
        }
      }
    }
    .collapsing {
      .twitter-edit-destroy {
        padding: 0 15px 10px;
        background-color: #f8f8f8;
        a {
          color: #999
        }
        a:hover {
          color: #333
        }
      }
      .card-body {
        padding: 15px 15px 10px;
        background-color: #f0f0f0;
        .review-box {
          padding: 15px 0 10px;
          img {
            width: 40px;
            height: 40px;
          }
          .media-heading {
            font-weight: bold;
            span {
              font-weight: normal;
              color: #999;
            }
          }
        }
      }
    }
  }
  .relation-box {
    .relation-title {
      margin-bottom: -8px;
    }
    .relation-list {
      img {
        margin: 8px 4px;
        height: 40px;
        width: 40px;
      }
    }
  }

  .note-empty {
    margin: 70px 0;
    color: #999;
  }

  .sign-in-box {
    p {
      font-size: 12px;
    }
    span {
      background-color: #ffe5e4;
      transition: 0.2s;
      padding: 4px 8px;
      border-radius: 3px;
      font-weight: bolder;
    }
    span:hover {
      background-color: #fed5d4;
      transition: 0.2s;
      color: #333;
    }
  }

  .sign-in-num {
    color: #fc726c;
    font-size: 20px;
    font-weight: bolder;
    letter-spacing: 3px;
  }

}
