portfolio/src/App.css

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 1em;
}

.nav .container {
  height: 3em;
}

.nav {
  background-color: rgb(47, 46, 58);
  height: 3em;
  box-shadow: inset 0px 3px 20px 10px rgba(0, 0, 0, 0.3);
}

.nav a {
  text-decoration: none;
  color: #e5e5ff;
  transition: 0.3s;
}

.nav a:hover {
  color: #fff;
  text-shadow: 0 0 5px #f2ef00;
}

.nav-items {
  display: flex;
  justify-content: space-between;
  height: 100%;
  align-items: center;
}

.menu-items {
  display: flex;
}

.menu-items div {
  margin-left: 1em;
}

.logo {
  font-size: 2em;
  font-weight: bold;
}

.hamburger {
  display: none;
}

.copyright {
  font-size: 0.7em;
  text-align: center;
}

.hamburger-menu {
  background-color: rgba(47, 46, 58, 0.9);
  z-index: 100;
  position: absolute;
  right: 0;
  backdrop-filter: blur(3px) contrast(60%);
  -webkit-backdrop-filter: blur(3px) contrast(60%);
  top: 3em;
  bottom: 0;
  left: 0px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
}

.hamburger-menu a {
  font-size: 2em;
  text-decoration: none;
  margin-right: 1em;
}

@media screen and (max-width: 768px) {
  .hamburger {
    display: inline;
  }
  .menu-items {
    display: none;
  }
}