.m3btn{
    position: relative;
    width: 40px;
    height: 40px;
    background: #3d3d3d;
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    border-radius: 6px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    overflow: hidden;
}

.m3btn span{
    position: absolute;
    width: 20px;
    height: 3px;
    background: #ffc118c2;
    border-radius: 4px;
    transition: 0.5s;
}

.m3btn span:nth-child(1){
    transform: translateY(-8px);
    width: 20px;
    left: 10px;
    transition-delay: 0.125s;
}

.m3btn.active span:nth-child(1){
    width: 20px;
    transform: translateY(0px) rotate(45deg);
}

.m3btn span:nth-child(2){
    transform: translateY(8px);
    width: 20px;
    left: 10px;
}

.m3btn.active span:nth-child(2){
    width: 20px;
    transform: translateY(0px) rotate(-45deg);
    transition-delay: 0.25s;
}

.m3btn.active span:nth-child(3){
    width: 0px;
}