.nav_yc {
    width: 100%;
    height:0px;
    overflow: hidden;
    background-color: rgba(0, 0, 0, 0.5);
    position: fixed;
    z-index: 8888888;
    transition: all 1s;
}

.nav_yc_title{
   display: flex !important;
   justify-content: space-between;
    color: white;
    height: 50px;
    line-height: 50px;
    display: block;
    background-color: rgba(0, 0, 0, 0.5);
    padding-left: 5%;
    border: 1px solid white;
}
.nav_yc_title a{
   
    color: white;
    height: 50px;
    line-height: 50px;
    display: block;
   
    padding-left: 5%;

    width: 70%;
}
.nav_yc_main >a{
    color: white;
    height: 50px;
    line-height: 50px;
    display: block;
    background-color: rgba(0, 0, 0, 0.5);
    padding-left: 10%;
    border: 1px solid white;
}
 /* 模态框箭头 */
 .jaintou{
    color: white;
    margin-right: 10%;
}
.off{
    height: 40px;
    width: 40px;
    margin: 30px auto;
    color: white;
}
.panel-collapse >div a{ 
    display: block;
    width: 100%;
    height:30px;
    line-height: 30px;
    padding-left: 10%;
    color: white;
    background-color: rgba(0, 0, 0, 0.3);
    
  }