#main-navigation img {
    max-width: 100%;
}

#main-navigation .nav-item {
    text-align: center !important;
    flex: 1 0 0%;
}

/* Small devices (landscape phones, 576px and up) */
/* @media (min-width: 576px) { ... } */

/* Medium devices (tablets, 768px and up) */
/* @media (min-width: 768px) { ... } */

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) { 
    #main-navigation ul {
        width: 75%;
    }
}

/* X-Large devices (large desktops, 1200px and up) */
/* @media (min-width: 1200px) { ... } */

/* XX-Large devices (larger desktops, 1400px and up) */
/* @media (min-width: 1400px) { ... } */