Preview:
.mobile_menu_bar:after {
    content: "MENU";
    position: relative;
    color: #fff!important;
    cursor: pointer;
    font-size: 17px;
    vertical-align: text-top;
}
/*Zneviditelneni hamburger menu*/
.mobile_menu_bar:before {
    opacity: 0;
  
.opened .mobile_menu_bar:after {
    content: "ZAVŘÍT";
}
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