/* .btn */
.btn{
    position: fixed;
    top: 0;
    right: 0;
    width: 60px;
    height: 60px;
    background-color: blue;
    z-index: 10;
}

.btn i{
    position: absolute;
    left: 10px;
    width: 40px;
    height: 2px;
    background-color: #fff;
    transition: .5s ;

}

.btn i:nth-of-type(1){
    top: 20px;
}
.btn i:nth-of-type(2){
    top: 30px;
}
.btn i:nth-of-type(3){
    top: 40px;
}

.btn.btn.active i:nth-of-type(1){
    transform: translateY(10px) rotate(45deg);

}
.btn.btn.active i:nth-of-type(2){
    opacity: 0;
}
.btn.btn.active i:nth-of-type(3){
    transform:translateY(-10px) rotate(-45deg);
}
/* .contener */
.contener{
    position: fixed;
    top: 0;
    bottom:0;
    left: 0;
    right: 0;
    background-color: cadetblue;
    color: #fff;
    z-index: 9;
    opacity: 0;
    pointer-events: none;
    transition: .5s ;
}
.contener.active{
   opacity: 1;
   pointer-events: auto;
}
/* .item */
.item{
   width:480px;
   margin: 50px auto;
   display: flex;
}

.item>ul{
    margin: 0 30px;
}
.item li{
    margin-bottom: 20px;
}