nav {
  display: flex;
  padding: 12px 40px;  
  justify-content: space-between;
  align-items: center;
}

nav img {
  width: 40px;
}

.logo {
  padding-top: 3px;
}

.logo a {
  font-family: Ubuntu, Helvetica, Arial, sans-serif;
  color: #00b592;
  text-decoration: none;
  font-size: 22px;
  font-weight: bold;
}

.navigation-bar {
  flex: 1;
  text-align: right;
}

.navigation-bar ul li {
  list-style: none;
  display: inline-block;
  padding: 15px;
  position: relative; 
}

.navigation-bar ul li a {
  font-family: Helvetica, Arial, sans-serif;  
  color: white;
  text-decoration: none;
  font-size: 15px;
}

.navigation-bar ul li::after {
  content: '';
  width: 0%;
  height: 2px;
  background: white;
  display: block;
  margin: auto;
  transition: 0.5s;
}

.navigation-bar ul li:hover::after {
  width: 100%;
}

.navigation-bar a:hover {
  color: #00AFEF;
}

nav .fa {
  display: none;
}

/* responsive */
@media (max-width: 700px) {
  .navigation-bar ul li {
    display: block;
  }

  .navigation-bar {
    position: fixed;
    background: #0387bb;
    height: 100vh;
    width: 150px;
    top: 0;
    right: -150px;
    text-align: left;
    z-index: 2;
    transition: 0.5s;
  }

  nav .fa {
    display: block;
    color: white;
    margin: 10px;
    font-size: 20px;
    cursor: pointer;
  }

  .navigation-bar ul {
    padding: 30px; 
  }

  .navigation-bar ul li::after {
    height: 0px;
  }

  .navigation-bar ul li:hover::after {
    width: 100%;
  }

  .navigation-bar a:hover {
    color: white;
  }
}