nav {
  &.primary-navigation {
    margin: 0 auto;
    display: block;
    padding: 0px 0 0 0;
    text-align: center;
    font-size: 16px;


    ul li {
      list-style: none;
      margin: 0 auto;
      border-left: 2px solid #3ca0e7;
      display: inline-block;
      padding: 0 30px;
      position: relative;
      text-decoration: none;
      text-align: center;
      font-family: arvo;
    }

    li a {
      color: black;
    }

    li a:hover {
      color: #3ca0e7;


    }

    li:hover {
      cursor: pointer;
    }

    ul li ul {
      visibility: hidden;
      opacity: 0;
      position: absolute;
      padding-left: 0;
      left: 0;
      display: none;
      background: white;
    }

    ul li:hover > ul,
    ul li ul:hover {
      visibility: visible;
      opacity: 1;
      display: block;
      min-width: 250px;
      text-align: left;
      padding-top: 20px;
      box-shadow: 0px 3px 5px -1px #ccc;
    }

    ul li ul li {
      clear: both;
      width: 100%;
      text-align: left;
      margin-bottom: 20px;
      border-style: none;
    }

    ul li ul li a:hover {
      padding-left: 10px;
      border-left: 2px solid #3ca0e7;
      transition: all 0.3s ease;
    }
  }
}

a {

    text-decoration: none;
    color: black;

    &:hover {
        color: #3CA0E7;
    }

}

 ul li ul li a { transition: all 0.5s ease; }



<!-- Anfang eigene css-Definitionen -->


font: {font-family: Bookman Old Style, sans-serif; /* Systemschriftart, falls Bookman Old Style nicht verfügbar */
}



.fliesstext{
         font-family: Bookman Old Style; serif;
         font-size: 15px;
         margin-left: 0px;
         margin-right: 0px;

}

.fliesstext2{
         font-family: Bookman Old Style; serif;
         font-size: 14px;
         margin-left: 50px;
         margin-right: 50px;

}

.fliesstext3{
         font-family: Bookman Old Style; serif;
         font-size: 14px;
         margin-left: 35px;
         margin-right: 60px;
         line-height: 1.8em;
}


.fliesstext4{
         font-family: Bookman Old Style; serif;
         font-size: 14px;

}

.linktext {font-size: 0.8em;
}

.ueber_01{
         font-family: Bookman Old Style; serif;
         font-size: 16px;
         font-weight: bold;
         margin-left: 35px;
         margin-right: 0px;
}

.ueber_03{
         font-family: Bookman Old Style; serif;
         font-size: 17px;
         font-weight: bold;
         margin-left: 0px;
         margin-right: 0px;

}


.ueber_02{
         font-family: Bookman Old Style; serif;
         font-size: 21px;
         font-weight: bold;
         margin-left: 0px;
         margin-right: 0px;
}

img {
  margin: 0px; /* Abstand um jedes Bild herum */
}




<!-- Ende eigene css-Definitionen -->