.bread {
    display: flex;
    justify-content: space-between;
    
  }

.material {
    margin-top: 1.7rem;
    width: 100%;
    background: rgb(65, 64, 64);
    transition: background 0.3s;
    z-index: 2;
    }
  
  .flter{
    float:right;
    font-size: 16px;
  }
  
  .flter .cat{
    margin-left: 10px;
  }
  .flter a{
    width: 160px;
    display: block;
    cursor: pointer;
  }
  
  .flter li {
    width: 160px;
    z-index: 2;
    position: relative;
    text-align: center;
    float: left;
    list-style: none;
    padding: 10px 0;
    background-color: rgba(0, 0, 0, 0.3);
  }
  
  .flter li ul{
    display: none;
    position: absolute;
    padding: 10px 0;
  }
  .flter li:hover ul {
    background-color: black;
    display: block;
  }
  
  .flter li:hover {
    background-color: black;
  }
  
  .flter li ul li:hover{
    background-color: gray;
  }