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HTML

              
                <!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Projeto Individual</title>
  <link rel="icon" type="image/png" href="./images/logo-uc.png" />
  <link rel="stylesheet" href="index.css" />
  <script src="https://kit.fontawesome.com/6c109bd4c4.js" crossorigin="anonymous"></script>
  <script src="index.js"></script>
</head>

<body>
  <scroll-container>
    <!-- Menu superior -->
    <nav class="nav-bar">
      <ul class="nav-bar-list" id="nav-bar-list-id">
        <!-- Primeiro item (Home) -->
        <li class="nav-bar-item">
          <a href="#scroll-page0"> <i class="fa-solid fa-house"></i> HOME</a>
        </li>

        <!-- Segundo item (Projetos) -->
        <li class="nav-bar-item">
          <a href="#scroll-page1">
            <i class="fa-solid fa-bars-progress"></i> PROJETOS</a>
        </li>

        <!-- Terceiro item (Quem somos) -->
        <li class="nav-bar-item">
          <a href="#scroll-page2">
            <i class="fa-solid fa-people-group"> </i> QUEM SOMOS
          </a>
        </li>

        <!-- Quarto item (registo) -->
        <li class="nav-bar-item">
          <a href="#scroll-page3">
            <i class="fa-solid fa-user-plus"> </i> REGISTO
          </a>
          <ul>
            <li class="nav-bar-subitem">
              <input type="text" name="username" id="username" placeholder="Username" />
            </li>
            <li class="nav-bar-subitem">
              <input type="password" name="password" id="password" placeholder="Password" />
            </li>
            <li class="nav-bar-subitem">
              <input type="submit" value="login" />
            </li>
          </ul>
        </li>

        <!-- Quinto item (login) -->
        <li class="nav-bar-item">
          <a href="#scroll-page4">
            <i class="fa-solid fa-right-to-bracket"> </i> LOGIN
          </a>
        </li>

        <!-- Sexto item (barra de pesquisa) -->
        <li class="nav-bar-item">
          <div id="search">
            <input id="input-search" type="text" placeholder="Search for news" />
            <input type="submit" id="search-button" value="submit" />
          </div>
        </li>

        <!-- Sétimo item (idiomas) -->
        <li class="nav-bar-item" id="nav-bar-item-languages">
          <select name="languages" id="languages">
            <option id="portuguese" class="option-language" value="portuguese">
              PT
            </option>
            <option id="english" class="option-language" value="english">
              EN
            </option>
          </select>
        </li>
      </ul>
    </nav>

    <!-- Primeira imagem grande -->
    <scroll-page id="scroll-page0">
      <div class="imagem1">
        <div class="description">
          <span class="border"> Casas do futuro </span>
        </div>
      </div>
    </scroll-page>

    <!-- Primeira seção de texto -->
    <scroll-page id="scroll-page1">
      <div class="outher-section">
        <h2 class="section-title">Últimas notícias</h2>
        <section class="section section-light">
          <div class="news-item">
            <img src="./images/container3.jpg" alt="Terceira notícia" class="news-image" width="200px" height="133px" />
            <br />
            <a href="#" title="Mansão ecológica">É possível ter uma casa luxuosa e ecolocicamente correta</a>
          </div>
          <div class="news-item">
            <img src="./images/container2.jpg" alt="Segunda notícia" class="news-image" width="200px" height="133px" />
            <br />
            <a href="#" title="Mansão ecológica">É possível ter uma casa luxuosa e ecolocicamente correta</a>
          </div>
          <div class="news-item">
            <img src="./images/container1.jpg" alt="Primeira notícia" class="news-image" width="200px" height="133px" />
            <br />
            <a href="#" title="Casa container luxuosa">Como são feitas as casas containers</a>
          </div>
        </section>
      </div>
    </scroll-page>

    <!-- Segunda imagem grande -->
    <div class="imagem2">
      <div class="description">
        <span class="border transparent"><strong>Sustentabilidade</strong></span>
      </div>
    </div>

    <!-- Segunda seção de texto -->
    <scroll-page id="scroll-page2">
      <div class="outher-section">
        <h2 class="section-title">Quem somos</h2>
        <section class="section section-light">
          <div class="news-item">
            <img src="./images/youko.png" alt="Terceira notícia" class="news-image" width="274px" height="244px" />
            <br />
            <a href="#" title="Alguém 0">Sujeito 0</a>
          </div>
          <div class="news-item">
            <img src="./images/inuyasha.png" alt="Segunda notícia" class="news-image" width="250px" height="273px" />
            <br />
            <a href="#" title="Alguém 1">Sujeito 1</a>
          </div>
          <div class="news-item">
            <img src="./images/hal.png" alt="Primeira notícia" class="news-image" width="278px" height="260px" />
            <br />
            <a href="#" title="Alguém 2">Sujeito 2</a>
          </div>
        </section>
      </div>
    </scroll-page>

    <!-- Terceira imagem grande -->
    <div class="imagem3">
      <div class="description">
        <div class="border transparent"><strong>Inovação</strong></div>
      </div>
    </div>

    <!-- Terceira seção de texto -->
    <scroll-page id="scroll-page3">
      <section class="section section-dark">
        <h2>Registo</h2>
        <form action="#" class="register">
          <input class="form-item" type="text" placeholder="Primeiro nome" />
          <br />
          <input class="form-item" type="text" placeholder="Último nome" />
          <br />
          <input class="form-item" type="text" placeholder="Username" />
          <br />
          <input class="form-item" type="password" name="password" id="password" placeholder="Palavra passe" />
          <br />
          <input class="form-item" type="email" name="email" id="email" placeholder="e-mail" />
          <br />
          <input class="form-item" type="url" name="photo" id="photo" placeholder="Foto URI" />
          <br />
          <input type="submit" value="Submeter" />
        </form>
      </section>
    </scroll-page>

    <!-- Última imagem grande -->
    <div class="imagem1">
      <div class="description">
        <div class="border">Ecológica</div>
      </div>
    </div>

    <!-- Última seção de texto -->
    <scroll-page id="scroll-page4">
      <section class="section section-dark">
        <h2>Login</h2>
        <form action="#" class="register">
          <input class="form-item" type="text" placeholder="Username" />
          <br />
          <input class="form-item" type="password" name="password" id="password" placeholder="Palavra passe" /> <br>
          <input type="submit" value="Submeter" />
        </form>
      </section>
    </scroll-page>
  </scroll-container>
</body>

</html>
              
            
!

CSS

              
                body,
html {
  height: 100%;
  margin: 0;
  font-size: 16px;
  font-family: "Lato", sans-serif;
  font-weight: 400;
  line-height: 1.8em;
  color: #666666;
  display: block;
  scroll-behavior: smooth; /* efeito de rolagem ao clicar em um link */
  background-color: whitesmoke;
}

/* CONFIGURAÇÕES DO MENU */
.nav-bar {
  position: fixed;
  width: 100%;
  z-index: 1;
  top: 0;
}

/* Nova classe a ser atribuída ao elemento com os estilos desejados */
.changeStyle {
  background-color: whitesmoke;
  box-shadow: 0 0 1em gray;
}

.nav-bar-list {
  list-style-type: none;
  margin: 0;
  padding: 0;
  top: 0;
  width: 100%;
  position: fixed;
  transition: background-color 0.3s ease-in-out; /* ainda não funciona */
}

.nav-bar-item {
  float: left;
}

.nav-bar-item a {
  display: inline-block;
  color: gray;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.nav-bar-item a:hover {
  background-color: #6666661f;
}

/* menu dropdown do login */
li {
  list-style: none;
  display: block;
}

.dropdown:hover .dropdown-content {
  display: block;
}

/* Mecanismo de busca */
#search {
  margin-top: 12px;
  padding-left: 200px;
}

#input-search:focus {
  box-shadow: 0 0 0 0;
  border: none;
  outline: 0;
  width: 300px;
}

/* Seletor de idiomas */
#nav-bar-item-languages {
  margin-top: 10px;
  right: 1px;
}

#languages {
  border: transparent;
  background-color: transparent;
}

#input-search {
  /* border: 4px ridge rgba(211, 220, 50, .6); */
  border: transparent;
  background-color: transparent;
}

#search-button {
  background-color: transparent;
  background-image: url("./images/magnifying-glass-solid.svg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: 12px;
  border: 0 none;
  width: 16px;
  height: 16px;
  position: relative;
  left: -24px; /* Botão dentro do input */
  top: -4px;
  font-size: 0px;
  cursor: pointer;
}

.fa-solid:hover {
  /* Começa a animação shake e fá-la durar por 0.5 segundos */
  animation: shake 0.5s;

  /* Quando a animação terminar, fá-la iniciar novamente */
  animation-iteration-count: infinite;
}

.nav-bar-subitem {
  display: none; /* Esconde os campos da navbar */
}

.nav-bar-subitem:hover {
  display: block; /*Não está funcionando !!!!!!!!!!!!!*/
}

@keyframes shake {
  0% {
    transform: translate(1px, 1px) rotate(0deg);
  }
  10% {
    transform: translate(-1px, -2px) rotate(-1deg);
  }
  20% {
    transform: translate(-3px, 0px) rotate(1deg);
  }
  30% {
    transform: translate(3px, 2px) rotate(0deg);
  }
  40% {
    transform: translate(1px, -1px) rotate(1deg);
  }
  50% {
    transform: translate(-1px, 2px) rotate(-1deg);
  }
  60% {
    transform: translate(-3px, 1px) rotate(0deg);
  }
  70% {
    transform: translate(3px, 1px) rotate(-1deg);
  }
  80% {
    transform: translate(-1px, -1px) rotate(1deg);
  }
  90% {
    transform: translate(1px, 2px) rotate(0deg);
  }
  100% {
    transform: translate(1px, -2px) rotate(-1deg);
  }
}
/* FIM DAS CONFIGURAÇÕES DO MENU */

.imagem1,
.imagem2,
.imagem3 {
  position: relative;
  opacity: 0.7;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;

  /*
    fixed = parallax
    scroll = normal
  */
  background-attachment: fixed;
}

.imagem1 {
  background-image: url("https://i.imgur.com/ui8XONA.jpg");
  min-height: 100%;
}

.imagem2 {
  background-image: url("https://i.imgur.com/qqvapmB.jpg");
  min-height: 400px;
}

.imagem3 {
  background-image: url("https://i.imgur.com/TWzCWDV.jpg");
  min-height: 100%;
}

.section {
  text-align: center;
  padding: 50px 80px;
  /* background-color: whitesmoke; */
}

.section-light {
  /* background-color: whitesmoke; */
  color: gray;
  display: flex;
  justify-content: space-around;
}

.section-dark {
  background-color: #282e34;
  color: azure;
}

/* Títulos de seções */
.section-title {
  display: flex;
  justify-content: center;
  /* background-color: whitesmoke; */
}

.description {
  position: absolute;
  top: 50%;
  width: 100%;
  text-align: center;
  color: black;
  font-size: 27px;
  letter-spacing: 8px;
  text-transform: uppercase;
}

.description .border {
  background-color: #111111;
  color: white;
  padding: 20px;
}

.description .border.transparent {
  background-color: transparent;
}

.form-item {
  width: 500px;
  height: 20px;
  margin: 5px;
}

@media (max-width: 568px) {
  .imagem1,
  .imagem2,
  .imagem3 {
    background-attachment: scroll;
  }
}

              
            
!

JS

              
                const desiredElement = document.getElementById("nav-bar-list-id"); // elemento alvo
const pixelsAmount = "50"; // Quantidade de pixels a contar do TOP até definir a cor

window.addEventListener("scroll", function () {
  if (window.scrollY > pixelsAmount) {
    desiredElement.classList.add("changeStyle"); // adiciona classe "changeColor"
  } else {
    desiredElement.classList.remove("changeStyle"); // remove classe "changeColor"
  }
});

              
            
!
999px

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