@media screen and (max-width: 450px) {
nav label {
    width:100%;
    margin-top:2px;
    margin-bottom:2px;
    padding:7px;
    border-top-left-radius: 0px;
    border-top-right-radius: 0px;
    border-bottom-left-radius: 0px;
    border-bottom-right-radius: 0px;
}
}