#hamburger-icon {
    margin: auto 0;
    display: none;
    cursor: pointer;
}
#hamburger-icon div {
    width: 30px;
    height: 2px;
    background-color: #000000;
    margin: 6px 0;
    transition: 0.4s;
    z-index: 99992;
}
#hamburger-icon.open div {
    background-color: #ffffff;
}
.open .bar1 {
    -webkit-transform: rotate(-45deg) translate(-7px, 8px);
    transform: rotate(-45deg) translate(5px, 8px);

    position: fixed;
    width: 35px !important;
    right: 25px;
    top: 50px;
}
.open .bar2 {
    opacity: 0;
}
.open .bar3 {
    -webkit-transform: rotate(45deg) translate(-7px, -8px);
    transform: rotate(45deg) translate(-4px, -13px);

    position: fixed;
    right: 23px;
    top: 65px;
    width: 35px !important;
}
.open .mobile-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    box-shadow: 0 0 10px rgb(0 0 0 / 25%);
    padding-top: 80px;
}
.mobile-menu {
    display: none;
    position: absolute;
    top: 0;
    right: 0;
    height: calc(100vh - 50px);
    height:100%;
    width: 80%;
    padding: 0;
    margin: 0;
    z-index: 9991;
    background: #000000;
    position: fixed;
}
.mobile-menu li {
    margin-bottom: 0;
    list-style-type: none;
    display: inline-block;
    width: 100%;
}
.mobile-menu li a{
    text-decoration: none;
    padding: 15px 0;
    display: block;
    width: 100%;
    font-size: 1.2rem;
    padding-left: 35px;
    color:#ffffff;
}   
.mobile-menu li a i{
    font-size: 22px;
    margin-right: 5px;
    font-weight: bold;
    text-shadow: 0 0 0 #000;
}
.header-topic img{
    width: auto;
    height: auto;
    max-height: 77px;
}


@media only screen and (max-width: 768px) {
    header{
        position: fixed;
        width: 50px;
        top: 25px;
        right: 10px;
        padding: 10px;
        height: 50px;
        background-color: #fff;
    }
    header nav {
        /* display: none; */
    }
    #hamburger-icon {
        display: block;
    }

}