style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background-color: #535353;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.menu-btn{
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 80px;
    height: 80px;
    cursor: pointer;
    transition: all .3s ease-in-out;
    border: 3px solid white;
}
.menu-btn_burger{
    width: 50px;
    height: 6px;
    background: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(255,101,47,.2);
    transition: all .5s ease-in-out;
}
.menu-btn_burger::before,.menu-btn_burger::after{
    content: '';
    position: absolute;
    width: 50px;
    height: 6px;
    background: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(255,101,47,.2);
    transition: all .5s ease-in-out;
}
.menu-btn_burger::before{
    transform: translateY(-16px);
}
.menu-btn_burger::after{
    transform: translateY(16px);
}

/* Animation  */
.menu-btn.open .menu-btn_burger{
    transform: translateX(-50px);
    background: transparent;
    box-shadow: none;
}
.menu-btn.open .menu-btn_burger::before{
transform: rotate(45deg) translate(35px,-35px);
}

.menu-btn.open .menu-btn_burger::after{
    transform: rotate(-45deg) translate(35px,35px);   
}