html,
body {
  background-color: #f5f5f5;
  height: 100%;
  overflow: hidden;
}

.left-list {
  position: absolute;
  right: calc(100% + 10px);
  top: 8%;
  min-width: 50px;
  padding: 0 10px;
  line-height: 3; // 12*3=36px
  text-align: center;
  border-right: 1px solid rgba(0, 0, 0, 0.6);
  .item {
    white-space: nowrap;
    a{
      display: inline-block;
      text-decoration: none;
      font-size: 1.2em;
    }
  }
}

.container {
  width: 1100px;
  margin: 0 auto;
}

.a-flex {
  display: flex;
}

/*
图片类样式
*/
.img-wrapper {
  width: 100px;
  height: 100px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
  border-radius: 50%;

  display: inline-block;
  box-sizing: border-box;
  border: 3px solid #000;
  img {
    width: 100%;
    height: 100px;
    -webkit-transition: 0.3s linear;
    transition: 0.3s linear;
    &:hover {
      transform: scale(1.1);
    }
  }

  .grayscale-img {
    -webkit-filter: grayscale(100%);
    filter: grayscale(100%);
  }
  .grayscale-img:hover {
    -webkit-filter: grayscale(0);
    filter: grayscale(0);
  } /* ============== * 深褐色过滤* ==============*/
  .sepia-img {
    -webkit-filter: sepia(100%);
    filter: sepia(100%);
  }
  .sepia-img:hover {
    -webkit-filter: sepia(0);
    filter: sepia(0);
  }
}