@media only screen and (max-width: 991px) {


    nav li{
        margin: 10px 0;
        text-align: center;
    }

}
@media only screen and (max-width: 767px) {

    .circle-img{
    width:90%;
    height: auto;
    border-radius: 50%;
    margin-left: 20px;
}
    
}