nav {
    display: flex;
    justify-content: center;
    background-color: #444;
    padding: 10px;
}
.abc1{
    text-align: center !important;
}

nav a {
    color: #fff;
    text-decoration: none;
    padding: 10px 20px;
    margin: 0 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #555;
    color: #fff;
    text-decoration: none;
}
.drawer-btn{
    color: #fff;
    display: none;
    cursor: pointer;
}

@media screen and (max-width: 768px) {
    nav {
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    nav a {
        margin: 5px;
    }
}
@media only screen and (max-width: 768px) {
    nav {
        flex-direction: column;
        align-items: center;
    }
    .drawer-btn {
        display: block;
        position: absolute;
        top: 9px;
        right: 30px;
    }
    nav.open a {
        display: block;
    }
    nav a {
        display: none;
        text-align: center;
    }
}