.cities__list {
    columns: 3;
    list-style: none;
    margin: 0 0 30px;
    padding: 0;
}
.cities__list_city {
    padding: 10px 0;
}
.cities__list_city-link {
    border-bottom: 1px dashed #369;
}
.cities__list_city-link:hover {
    border-bottom-color: #00000000 ;
}

@media screen and (max-width: 480px) {
    .cities__list {
        columns: 2;
    }
}