@charset "utf-8"; 

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

.ham3_btn{
    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), span:nth-child(3){top: 13px;}
span:nth-child(4){top: 26px;}


.ham3_btn.active span:nth-child(1),
.ham3_btn.active span:nth-child(4)
{
    opacity: 0;
}


.ham3_btn.active span:nth-child(2){
    transform: rotate(45deg);
}
.ham3_btn.active span:nth-child(3){
    transform: rotate(-45deg);
}