.nav--button {
    height: auto;
    white-space: normal;
}

.flex {
    display: flex;
    flex-flow: row wrap;
    justify-content: space-between;
    align-content: stretch;
}

.flex__item {
    width: 49%;
    margin: 0 0 15px;
}

@media all and (max-width: 768px){
    .flex__item {
        width: 100%;
    }
}