Add target blank for social links

<script>
/* Make the secondary menu social link add new tab when visiting */
jQuery(document).ready(function($){
    $('.et-social-icon .icon').each(function(){
        $(this).attr('target', 'blank');
    });
});
</script>

Initial CSS for DIVI Theme

/* Remove action bar while scrolling */
.et_fixed_nav #top-header {
	position: absolute !important;
}
.et-fixed-header {
	top: 0px !important;
}

/* Change the color of search icon */
#et_search_icon:hover,
.mobile_menu_bar_toggle:before {
	color: #c64a2c;
}

/* Make the mobile menu sticky */
.et_mobile_menu {
	border-top: 3px solid #c64a2c;
	overflow-y: auto !important;
    max-height: 70vh;
}
@media (max-width: 980px) {
   .et_non_fixed_nav.et_transparent_nav #main-header,
   .et_non_fixed_nav.et_transparent_nav #top-header,
   .et_fixed_nav #main-header,
   .et_fixed_nav #top-header {
        position: fixed;
    }
}

/* Redesign the copyright section in footer */
#footer-info {
	float: none;
	text-align: center;
}
#footer-info a:hover {
	color: #c13b1a;
}

/**
 * Change the RSS icon to IG icon
 * simple trick to add IG social link in secondary menu
 * */
.et-social-rss a.icon:before {
	content: "\e09a";
}

/* Footer social media icon */
footer .zoom-social-icons-list li {
	padding-left: 0 !important;
}
footer .zoom-social-icons-list li:before {
	display: none;
}

/* Center the footer logo */
@media ( max-width: 767px ) {
	#footer-widgets .footer-widget:first-child {
		text-align: center;
	}
	#footer-widgets .footer-widget > div {
		float: none;
	}
	#footer-widgets .footer-widget:first-child .widget_media_image img {
		max-width: 200px !important;
	}
}

/* Make the button inline */
.__welcome_message .et_pb_button_module_wrapper {
	display: inline-block;
	vertical-align: top;
}

/* === Begin: Set the divi slider height === */
/* Src: https://divibooster.com/changing-the-height-of-the-divi-slider/ */

/* Desktop */
.myslider .et_pb_slide .et_pb_container {
	height: auto !important;
	min-height: 550px !important;
}
/* Tablet */
@media only screen and (min-width: 768px) and (max-width: 980px) {
	.myslider .et_pb_slide .et_pb_container {
		height: auto !important;
		min-height: 400px !important;
	}
}
/* Phone */
@media only screen and (max-width: 767px) {
	.myslider .et_pb_slide .et_pb_container {
		height: auto !important;
		min-height: 300px !important;
	}
}

/* Handle padding */
.myslider .et_pb_slide {
	padding-bottom: 0px !important;
}
.myslider div.et_pb_slide_description, 
.myslider .et_pb_slider_fullwidth_off div.et_pb_slide_description {
	padding-top: 1%;
	padding-bottom: 1%;
}

/* === End: Set divi slider height === */

Submenu mobile DIVI

<style type="text/css">
	#main-header .et_mobile_menu .menu-item-has-children > a {
		background-color: transparent;
		position: relative;
	}
	#main-header .et_mobile_menu .menu-item-has-children > a:after {
		font-family: 'ETmodules';
		text-align: center;
		speak: none;
		font-weight: normal;
		font-variant: normal;
		text-transform: none;
		-webkit-font-smoothing: antialiased;
		position: absolute;
	}
	#main-header .et_mobile_menu .menu-item-has-children > a:after {
		font-size: 16px;
		content: '\4c';
		top: 13px;
		right: 10px;
	}
	#main-header .et_mobile_menu .menu-item-has-children.visible > a:after {
		content: '\4d';
	}
	#main-header .et_mobile_menu ul.sub-menu {
		display: none !important;
		visibility: hidden !important;
		transition: all 1.5s ease-in-out;
	}
	#main-header .et_mobile_menu .visible > ul.sub-menu {
		display: block !important;
		visibility: visible !important;
	}
</style>

<script type="text/javascript">
	(function($) {

		function setup_collapsible_submenus() {
			var $menu = $('#mobile_menu'),
				top_level_link = '#mobile_menu .menu-item-has-children > a';

			$menu.find('a').each(function() {
				$(this).off('click');

				if ( $(this).is(top_level_link) ) {
					$(this).attr('href', '#');
				}

				if ( ! $(this).siblings('.sub-menu').length ) {
					$(this).on('click', function(event) {
						$(this).parents('.mobile_nav').trigger('click');
					});
				} else {
					$(this).on('click', function(event) {
						event.preventDefault();
						$(this).parent().toggleClass('visible');
					});
				}
			});
		}

		$(window).load(function() {
			setTimeout(function() {
				setup_collapsible_submenus();
			}, 700);
		});

	})(jQuery);
</script>