header {
  width: 100%;
  padding: 15px 0 30px;
  background-color: #466c95;
}

header nav {
  display: flex;
  justify-content: center;
  align-items: center;
}

header ul {
  list-style-type: none;
  display: flex;
  padding: 0;
  margin: 0;
}

header li {
  margin: 0 30px;
}

header a {
  text-decoration: none;
  color: #fff;
  text-transform: uppercase;
  position: relative;
}

.effect-4 a:before {
  content: "[";
  left: -5px;
}

.effect-4 a:after {
  content: "]";
  right: -5px;
}

.effect-4 a:before,
.effect-4 a:after {
  position: absolute;
  opacity: 0;
  color: #fff;
  top: -1px;
  transition: all 0.5s;
}

.effect-4 a:hover:before,
.effect-4 a:hover:after {
  opacity: 0.7;
}

.effect-4 a:hover:before {
  left: -20px;
}

.effect-4 a:hover:after {
  right: -20px;
}
header nav ul {
  position: relative;
  width: max-content;
}
.second-nav {
  position: absolute;
  left: 50%;
  top: 27px;
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity 0.5s;
}

header li:hover .second-nav,
header .second-nav:hover {
  opacity: 1;
}

.second-nav * {
  font-size: 11px;
}

@media (max-width: 768px) {
  .second-nav {
    display: none;
  }
}