.navbar-toggler {
    padding: 0.15rem 0.35rem !important;  /* Reduce padding */
    font-size: 2rem !important;           /* Reduce icon size */
    line-height: 1 !important;
    border-radius: 0 !important;   /* Remove rounded corners */
    box-shadow: none !important;   /* Remove any ring/shadow */
    border-width: 0px !important;  /* Make border thinner if desired */
    border-color: #fff !important;
}
.navbar-toggler-icon {
    width: 1.2em !important;              /* Make icon thinner */
    height: 1.2em !important;
}