Add Hamburger closing menu icon in Wordpress

  /****** Menu slide-in with background image*******/

/* Hide submenu */
.et_mobile_menu .menu-item-has-children > a { 
	background-color: transparent; 
}
#main-header .et_mobile_menu li ul.sub-menu.hide { 
	display: none !important; 
	visibility: hidden !important;  
	transition: .7s ease-in-out;
}
#main-header .et_mobile_menu li ul.sub-menu.visible { 
	display: block !important; 
	visibility: visible !important; 
}
.et_mobile_menu .menu-item-has-children > a:after { 
	font-family: "ETmodules";
         font-size: 22px;
         font-weight: 800;
         content: "3"; 
	position: absolute; 
	right: 50px;
}

/* Font Awesome */
.fa {
    margin-right: 15px ;
  }
@media only screen and (max-width: 980px){
#mobile_menu {
    display: block !important;
    min-height: 100vh;
    height: 100%;
    top: 0;
    right: 0;
    position: fixed;
    z-index: 9998;
    overflow: scroll;
    border-top: none;
    padding-top: 60px !important;
}
.et_mobile_menu li:nth-child(1) {
    padding-top: 20px;
}
.et_mobile_menu li a {
    color: #fff !important;
    width: 100%;
    float: left;
    border: none !important;
    text-align: left;
    margin: 5px 10px;
    transition: .2s;
    text-transform: uppercase;
    font-size: 1.4em !important;
}
.mobile_nav ul#mobile_menu .current_page_item > a {
    color: #fff !important;
background-color: rgba(255, 255, 255, 0.1);
border-radius: 30px;
padding-left: 20px;
}
.mobile_nav.closed #mobile_menu {
	-moz-background-size: cover;
    -o-background-size: cover;
    -webkit-background-size: cover;
    background: linear-gradient(
      rgba(66, 66, 66, 0.50),
      rgba(66, 66, 66, 0.90)
    ), /* ------ Here you can customize the overlay effect by adding the color you want in rgba format. NOTE: adding two colors you can create a gradient effect  ----- */

    url("https://minnesotaskatingcoach.com/wp-content/uploads/2018/04/MPY_BMR_20180410_0039-XL.jpg"); /* ----- Add here the url of the image you want as background ----- */
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    -webkit-transform: translateX(100%);
    -moz-transform: translateX(100%);
    -ms-transform: translateX(100%);
    -o-transform: translateX(100%);
    transform: translateX(100%);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-transition: -webkit-transform 0.4s 0s;
    -moz-transition: -moz-transform 0.4s 0s;
    transition: transform 0.4s 0s;
}

.mobile_nav.opened #mobile_menu {
	-moz-background-size: cover;
    -o-background-size: cover;
    -webkit-background-size: cover;
    background: linear-gradient(
      rgba(66, 66, 66, 0.50),
      rgba(66, 66, 66, 0.90)
    ),
    url("https://minnesotaskatingcoach.com/wp-content/uploads/2018/04/MPY_BMR_20180410_0039-XL.jpg");
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    -webkit-transform: translateX(0);
    -moz-transform: translateX(0);
    -ms-transform: translateX(0);
    -o-transform: translateX(0);
    transform: translateX(0);
    -webkit-overflow-scrolling: touch;
    -webkit-transition: -webkit-transform 0.4s 0s;
    -moz-transition: -moz-transform 0.4s 0s;
    transition: transform 0.4s 0s;
}

	/*** displays the "x" close icon ***/
.show-submenu .hamburger:before {
    content: "\4d";
}

	
	
#main-header .container.clearfix.et_menu_container {
    width: 100%;
}

.mobile_menu_bar:before {
    padding-right: 10px;
	color: #ffffff !important;
}
.mobile_nav.opened .mobile_menu_bar:before {
    content: "\4d";    
	color: #fff !important;
    border: 1px solid #fff;
    width: 30px;
    height: 30px;
    border-radius: 50%;
	
}
}

 
 @media only screen and  (max-width: 980px) {
  .et_header_style_split .mobile_menu_bar, .et_header_style_left .mobile_menu_bar {    
    z-index: 9999;
  }
  #et-top-navigation {    
    padding-right: 5px;
  }
}

@media only screen and  (min-width: 481px) {
  #mobile_menu {    
    width: 320px;    
    margin-left: calc(100% - 320px);
  }
}

@media only screen and (max-width: 480px)  {
  #mobile_menu {    
    width: 260px;    
    margin-left: calc(100% - 260px);
  }
}

@media only screen and  (max-width: 340px) {
  #mobile_menu {    
    width: 100%;    
    margin-left: 0;
  }
}