twentyseventeen child theme: Keep navigation menu for smaller breakpoints

child-theme.css

@media screen and (min-width: 38em) { /* default is 48em */

	/* Navigation */

	.navigation-top {
		bottom: 0;
		font-size: 14px;
		font-size: 0.875rem;
		left: 0;
		position: absolute;
		right: 0;
		width: 100%;
		z-index: 3;
	}

	.navigation-top .wrap {
		max-width: 1000px;
		/* The font size is 14px here and we need 50px padding in ems */
		padding: 0.75em 3.4166666666667em;
	}

	.navigation-top nav {
		margin-left: -1.25em;
	}

	.site-navigation-fixed.navigation-top {
		bottom: auto;
		position: fixed;
		left: 0;
		right: 0;
		top: 0;
		width: 100%;
		z-index: 7;
	}

	.admin-bar .site-navigation-fixed.navigation-top {
		top: 32px;
	}

	/* Main Navigation */

	.js .menu-toggle,
	.js .dropdown-toggle {
		display: none;
	}

	.main-navigation {
		width: auto;
	}

	.js .main-navigation ul,
	.js .main-navigation ul ul,
	.js .main-navigation > div > ul {
		display: block;
	}

	.main-navigation ul {
		background: transparent;
		padding: 0;
	}

	.main-navigation > div > ul {
		border: 0;
		margin-bottom: 0;
		padding: 0;
	}

	.main-navigation li {
		border: 0;
		display: inline-block;
	}

	.main-navigation li li {
		display: block;
	}

	.main-navigation a {
		padding: 1em 1.25em;
	}

	.main-navigation ul ul {
		background: #fff;
		border: 1px solid #bbb;
		left: -999em;
		padding: 0;
		position: absolute;
		top: 100%;
		z-index: 99999;
	}

	.main-navigation ul li.menu-item-has-children:before,
	.main-navigation ul li.menu-item-has-children:after,
	.main-navigation ul li.page_item_has_children:before,
	.main-navigation ul li.page_item_has_children:after {
		border-style: solid;
		border-width: 0 6px 6px;
		content: "";
		display: none;
		height: 0;
		position: absolute;
		right: 1em;
		bottom: -1px;
		width: 0;
		z-index: 100000;
	}

	.main-navigation ul li.menu-item-has-children.focus:before,
	.main-navigation ul li.menu-item-has-children:hover:before,
	.main-navigation ul li.menu-item-has-children.focus:after,
	.main-navigation ul li.menu-item-has-children:hover:after,
	.main-navigation ul li.page_item_has_children.focus:before,
	.main-navigation ul li.page_item_has_children:hover:before,
	.main-navigation ul li.page_item_has_children.focus:after,
	.main-navigation ul li.page_item_has_children:hover:after {
		display: block;
	}

	.main-navigation ul li.menu-item-has-children:before,
	.main-navigation ul li.page_item_has_children:before {
		border-color: transparent transparent #bbb;
		bottom: 0;
	}

	.main-navigation ul li.menu-item-has-children:after,
	.main-navigation ul li.page_item_has_children:after {
		border-color: transparent transparent #fff;
	}

	.main-navigation ul ul li:hover > ul,
	.main-navigation ul ul li.focus > ul {
		left: 100%;
		right: auto;
	}

	.main-navigation ul ul a {
		padding: 0.75em 1.25em;
		width: 16em;
	}

	.main-navigation li li {
		-webkit-transition: background-color 0.2s ease-in-out;
		transition: background-color 0.2s ease-in-out;
	}

	.main-navigation li li:hover,
	.main-navigation li li.focus {
		background: #767676;
	}

	.main-navigation li li a {
		-webkit-transition: color 0.3s ease-in-out;
		transition: color 0.3s ease-in-out;
	}

	.main-navigation li li.focus > a,
	.main-navigation li li:focus > a,
	.main-navigation li li:hover > a,
	.main-navigation li li a:hover,
	.main-navigation li li a:focus,
	.main-navigation li li.current_page_item a:hover,
	.main-navigation li li.current-menu-item a:hover,
	.main-navigation li li.current_page_item a:focus,
	.main-navigation li li.current-menu-item a:focus {
		color: #fff;
	}

	.main-navigation ul li:hover > ul,
	.main-navigation ul li.focus > ul {
		left: 0.5em;
		right: auto;
	}

	.main-navigation .menu-item-has-children > a > .icon,
	.main-navigation .page_item_has_children > a > .icon {
		display: inline;
		left: 5px;
		position: relative;
		top: -2px;
	}

	.main-navigation ul ul .menu-item-has-children > a > .icon,
	.main-navigation ul ul .page_item_has_children > a > .icon {
		margin-top: -9px;
		left: auto;
		position: absolute;
		right: 1em;
		top: 50%;
		-webkit-transform: rotate(-90deg); /* Chrome, Safari, Opera */
		-ms-transform: rotate(-90deg); /* IE 9 */
		transform: rotate(-90deg);
	}

	.main-navigation ul ul ul {
		left: -999em;
		margin-top: -1px;
		top: 0;
	}

	.main-navigation ul ul li.menu-item-has-children.focus:before,
	.main-navigation ul ul li.menu-item-has-children:hover:before,
	.main-navigation ul ul li.menu-item-has-children.focus:after,
	.main-navigation ul ul li.menu-item-has-children:hover:after,
	.main-navigation ul ul li.page_item_has_children.focus:before,
	.main-navigation ul ul li.page_item_has_children:hover:before,
	.main-navigation ul ul li.page_item_has_children.focus:after,
	.main-navigation ul ul li.page_item_has_children:hover:after {
		display: none;
	}

	.site-navigation-fixed.navigation-top .menu-scroll-down {
		display: none;
	}

	/* Scroll down arrow */

	.navigation-top .menu-scroll-down {
		color: #767676;
		display: block;
		padding: 0.5em 0.5em 0.4em;
		position: absolute;
		right: 0;
		top: 0.9em;
		-webkit-transform: rotate(90deg); /* Chrome, Safari, Opera */
		-ms-transform: rotate(90deg); /* IE 9 */
		transform: rotate(90deg);
	}

	.menu-scroll-down:focus {
		outline: thin dotted;
	}

	.menu-scroll-down .icon {
		height: 32px;
		height: 2rem;
		width: 32px;
		width: 2rem;
	}
}