<nav class="navbar navbar-expand-lg navbar-light bg-light">
              <a class="navbar-brand" href="#">Home</a>
              <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
              <span class="navbar-toggler-icon"></span>
              </button>
              <div class="collapse navbar-collapse" id="navbarNavDropdown">
              <ul class="navbar-nav">

                      <li class="nav-item dropdown">
                          <a class="nav-link" href="#">Katalog<span class="sr-only">(current)</span></a>
                          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                          <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                            <a class="dropdown-item" id="kopf" href="#">Kopf</a>
                            <a class="dropdown-item" id="brust" href="#">Brust</a>
                            <a class="dropdown-item" id="beine" href="#">Beine</a>
                      </li>

                      <li class="nav-item">
                          <a class="nav-link" href="#">Tätowierer</a>