@charset "utf-8";

body{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}


.ham_btn{
    display: block;
    width: 45px;
    height: 34px;
    position: relative;
}
span{
    position: absolute;
    top: 0;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: #666;
    transition: 0.2s;
}


span:nth-child(1){top: 0;}
span:nth-child(2){top: 13px;}
span:nth-child(3){top: 13px;}
span:nth-child(4){top:26px;}

.ham_btn.active span:nth-child(1),
.ham_btn.active span:nth-child(4)
{opacity: 0;}

.ham_btn.active span:nth-child(2){
    transform: rotate(45deg);
}
.ham_btn.active span:nth-child(3){
    transform: rotate(-45deg);
}