@font-face {
  font-family: "oswald";
  src: url("../FONTS/oswald.regular.ttf");
  font-family: "lato";
  src: url("../fonts/Lato-Regular.ttf");
  font-family: "playfairdisplay";
  src: url("../fonts/PlayfairDisplaySC-Regular.otf");
}

body {
  background: #white;
  color: #ffffff;
  margin: 0;
  word-wrap: break-word !important;
  font-family: oswald;
}

a {
  color: #FFF;
}

#container {
  margin: 0 auto;
  max-width: 890px;
}

.toggle,
[id^=drop] {
  display: none;
}

nav {
  margin: 0px;
  padding: 15px 10px -1px 10px;
  background-color: #01B2C0;
  position: relative;
  z-index: 10;
}

#logo_header {
  display: block;
  padding: 0px 30px 0px 15px;
  float: left;
  line-height: 60px;
}

nav:after {
  content: "";
  display: table;
  clear: both;
}

nav ul {
  float: none;
  padding: 0;
  margin: 0;
  list-style: none;
  position: absolute;
  left: 137px;
  padding: 44px 37px 35px 120px;
}

nav ul li {
  margin: 0px;
  display: inline-block;
  background-color: #01B2C0;
  position: relative;
  padding: 0px 5px 0px 5px;
}

nav a {
  display: block;
  padding: 10px 15px;
  color: #000000;
  font-size: 24px;
  text-decoration: none;
  position: relative;
}

nav ul li ul li:hover {
  border: solid 1px;
  background: #07858f;
}

nav a:hover {
  background-color: #07858f;
}

nav ul ul {
  display: none;
  position: absolute;
  top: 25px;
  left: -100px;
}

nav ul li:hover>ul {
  display: inherit;
}

nav ul ul li {
  width: 170px;
  float: none;
  display: list-item;
  position: relative;
}

nav ul ul ul li {
  position: relative;
  top: -60px;
  left: 170px;
}

li>a:after {
  content: ' +';
}

li>a:only-child:after {
  content: '';
}

#header_bar {
  padding: 5px 0px 0px 0px;
  min-height: 50px;
  background-color: #01B2C0;
  margin: auto;
  color: #000000;
  font-size: 25px;
}

#header_bar_text {
  background-color: #01B2C0;
  margin: 0px 0px 0px 0px;
  text-align: center;
}

@media all and (max-width : 768px) {
  #logo_header {
    display: block;
    padding: 0;
    width: 100%;
    text-align: center;
    float: none;
  }

  nav {
    margin: 0;
  }

  .toggle+a,
  .menu {
    display: none;
  }

  .toggle {
    display: block;
    background-color: #254441;
    padding: 14px 20px;
    color: #FFF;
    font-size: 17px;
    text-decoration: none;
    border: none;
  }

  .toggle:hover {
    background-color: #000000;
  }

  [id^=drop]:checked+ul {
    display: block;
  }

  nav ul li {
    display: block;
    width: 100%;
  }

  nav ul ul .toggle,
  nav ul ul a {
    padding: 0 40px;
  }

  nav ul ul ul a {
    padding: 0 80px;
  }

  nav a:hover,
  nav ul ul ul a {
    background-color: #000000;
  }

  nav ul li ul li .toggle,
  nav ul ul a,
  nav ul ul ul a {
    padding: 14px 20px;
    color: #FFF;
    font-size: 17px;
  }

  nav ul li ul li .toggle,
  nav ul ul a {
    background-color: #212121;
  }

  nav ul ul {
    float: none;
    position: static;
    color: #ffffff;
  }

  nav ul ul li:hover>ul,
  nav ul li:hover>ul {
    display: none;
  }

  nav ul ul li {
    display: block;
    width: 100%;
  }

  nav ul ul ul li {
    position: static;
  }
}

@media all and (max-width : 330px) {
  nav ul li {
    display: block;
    width: 94%;
  }
}

<nav>audio {
  display: none;
}

button {
  font-size: 16px;
  color: #eee;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 50px;
  padding: 15px;
  border: none;
  border-radius: 2px;
  outline: none;
  background: rgba(115, 67, 167, 0.8);
  box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
  opacity: 0.8;
  cursor: pointer;
  transition: all 0.4s ease-out;
}

button.fade:hover {
  opacity: 0.8;
}

.fade {
  opacity: 0.2;
  top: 0;
  left: 0;
  transform: translate(0, 0);
}