#hamburger-1 .line {
    width: 25px;
    height: 3px;
    background-color: black;
    display: block;
    margin: 5px auto;
    -webkit-transition: all 0.3s ease-in-out;
    -o-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
}

#hamburger-1:hover {
    cursor: pointer;
}

#hamburger-1.is-active .line:nth-child(2) {
    opacity: 0;
}

#hamburger-1.is-active .line:nth-child(1) {
    -webkit-transform: translateY(6px) rotate(45deg);
    -ms-transform: translateY(6px) rotate(45deg);
    -o-transform: translateY(6px) rotate(45deg);
    transform: translateY(6px) rotate(45deg);
}

#hamburger-1.is-active .line:nth-child(3) {
    -webkit-transform: translateY(-10px) rotate(-45deg);
    -ms-transform: translateY(-10px) rotate(-45deg);
    -o-transform: translateY(-10px) rotate(-45deg);
    transform: translateY(-10px) rotate(-45deg);
}