First-Website/resources/css/navbar.css

.navigation {
  position: fixed;
  top: 0px;
  height: 55px;
  width: 100%;
  background-color: #101012;
  z-index: 3;
}
.navigation button {
  padding: .5rem;
  height: 100%;
  transition: color .5s;
  border: 0;
  background-color: transparent;
  color: white;
  display: inline;
}
.navigation button:focus {
  outline: 0;
}
.navbarList {
  list-style: none;
  margin: 0;
  padding: 0;
}
.navList {
  float: left;
}
.navigation i {
  margin: 10px 15px 10px 10px;
}
.dropdownList {
  background-color: #101012;
  margin: 0;
  padding: 0;
  list-style: none;
}
.dropdownButton {
  width: 100%;
}
.navList:hover .dropdownList {
  display: block!important;
}
.navigation button:hover {
  color: #9c9c9c!important;
}

/* Switch */
.appearance {
  position: absolute;
  display: inline-block;
  width: 60px;
  height: 34px;
  top: .7rem;
  right: 1.5rem;
}
.appearance input {
  opacity: 0;
  width: 0;
  height: 0;
}
.appearanceSlider {
  position: absolute;
  cursor: pointer;
  border-radius: 34px;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .3s;
}
.appearanceSlider:before {
  position: absolute;
  border-radius: 50%;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .3s;
}
input:checked + .appearanceSlider {
  background-color: #2E3747;
}
input:checked + .appearanceSlider:before {
  transform: translateX(25px);
}