style.css

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: #262626;
}

nav {
  overflow: hidden;
  background-color: #1c1c1c;
  border-radius: 0px 0px 10.5px 10.5px
}

nav a {
  float: right;
  display: block;
  color: #ffffff;
  text-align: center;
  padding: 15px 15px;
  text-decoration: none;
  font-size: 15.5px;
}

nav a:hover {
  background-color: #0f0f0f;
  color: #ffffff;
  transition: 1.5s;
}

nav a.active {
  background-color: #4c24ff;
  color: white;
}

nav a.active:hover {
  background-color: #2f00ff;
  color: white;
  transition: 1.5s;
}

nav .icon {
  display: none;
}

@media screen and (max-width: 555px) {
  nav a:not(:first-child) {display: none;}
  nav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 555px) {
  nav.responsive {position: relative;}
  nav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  nav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}