.nav{
  overflow: hidden;
  width: 100%;
  overflow-x: auto;
  .left{
    padding: 10px 2px;
    background: #f0f0f0;
    margin-bottom: 10px;
    float: left;
    width: 120%;
    overflow: hidden;
    overflow-x: auto;
    list-style: none;
    li{
      border: 1px #a9aabb solid;
      text-align: center;
      font-size: 14px;
      height: 30px;
      line-height: 30px;
      border-radius: 20px;
      margin: 0px 2px;
      float: left;
      width: 15.6%;
    }
    li.actived{
      background-color: #ff5a32;
      color: #fff;
      border: 1px #f0f0f0 solid;
    }
  }
}
.nav::-webkit-scrollbar{                    
  opacity: 0;
  }
.materialContainer {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  grid-row-gap: 10px;
  grid-column-gap: 10px;
  
  .materialItem {
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f7f7f7;
    padding: 14px;
    box-sizing: border-box;
    .title {
      font-size: 12px;
      line-height: 1.1;
    }
  }
}
