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HTML 

              
                <div class='wrapper'>
  <div class="container">
    <header id="home">
      <nav class="navbar">
        <h2 class='name'>Sachin Samal</h2>
        <ul class="navbar__ul">
          <li class='link'><a href="#portfolio">Projects</a></li>
          <li class='link'><a href="#skills">Skills</a></li>
          <li class='link'><a href="#contact">Contact</a></li>
          <li>
            <!-- Dark Theme Toggle  -->
            <button class='darkmode'><i class="fas fa-moon"></i></button>
          </li>
        </ul>
      </nav>
      <div class="header__container">
        <img src="https://avatars.githubusercontent.com/u/88958992?v=4" alt="profile-image">
        <div class="header__text__container">
          <p class="header__text">Hi! I am a front-end designer and developer. Here, I've created a simple beginner friendly portfolio template responsive across different browsers and devices. Feel free to use and make any changes as per your need.</p>
        </div>
      </div>
    </header>
  </div>

  <main class="portfolio" id='portfolio'>
    <h2 class='portfolio__header'>Projects</h2>
    <div class="portfolio__container">
      <article class='card'>
        <img src='https://cdn-icons-png.flaticon.com/512/3437/3437297.png' alt="page">
        <div class="text-container">
          <h2>Connection Page</h2>
          <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
        </div>
      </article>

      <article class='card'>
        <img src='https://cdn-icons-png.flaticon.com/512/993/993725.png' alt="page">
        <div class="text-container">
          <h2>Data Collection App</h2>
          <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
        </div>
      </article>

      <article class='card'>
        <img src='https://cdn-icons-png.flaticon.com/512/1055/1055645.png' alt="app">
        <div class="text-container">
          <h2>Search App</h2>
          <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
        </div>
      </article>

      <article class='card'>
        <img src='https://cdn-icons-png.flaticon.com/512/4257/4257674.png' alt="app">
        <div class="text-container">
          <h2>Favorite Spots</h2>
          <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
        </div>
      </article>

      <article class='card'>
        <img src='https://cdn-icons-png.flaticon.com/512/5956/5956494.png' alt="gallery">
        <div class="text-container">
          <h2>Project Gallery</h2>
          <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
        </div>
      </article>

      <article class='card'>
        <img src='https://cdn-icons-png.flaticon.com/512/891/891175.png' alt="Calculator">
        <div class="text-container">
          <h2>Calculator</h2>
          <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
        </div>
      </article>
    </div>

    <section class='skills' id='skills'>
      <h2>Skills</h2>
      <article class="skills-container">
        <div class="skills__item" data-aos='fade-up'>
          <img src="https://cdn-icons-png.flaticon.com/512/1199/1199124.png" alt="JS">
          <p>Javascript</p>
        </div>

        <div class="skills__item" data-aos='fade-up'>
          <img src="https://cdn-icons-png.flaticon.com/512/1051/1051277.png" alt="HTML5">
          <p>HTML5</p>
        </div>

        <div class="skills__item" data-aos='fade-up'>
          <img src="https://cdn-icons-png.flaticon.com/512/732/732190.png" alt="css">
          <p>CSS3</p>
        </div>

        <div class="skills__item" data-aos='fade-up'>
          <img src="https://cdn-icons-png.flaticon.com/512/5968/5968705.png" alt="figma">
          <p>Figma</p>
        </div>

        <div class="skills__item" data-aos='fade-up'>
          <img src="https://cdn-icons-png.flaticon.com/512/5968/5968559.png" alt="Github">
          <p>Github</p>
        </div>
      </article>
    </section>

    <footer>
      <div class="wrapper">
        <div class="footer__text-container" id='contact'>
          <h2>Contact</h2>
          <p>Lets connect if you want to collaborate...</p>
        </div>
        <div class="footer__text-container1">
          <p><span class='phone'>Phone</span> <strong>+1 (111) 222-3333</strong></p>
          <p><span class='email'>Email</span> <strong>123@gmail.com</strong></p>
        </div>
      </div>
      <hr class='footer__nav-hr'>
      <nav class="footer__nav">
        <h3>Sachin</h3>
        <ul class='footer__nav-links'>
          <li><a href="#home">Home</a></li>
          <li><a href="#portfolio">Projects</a></li>
        </ul>
        <p class='to-top'><a href="#top"><strong>BACK TO TOP</strong></a></p>
      </nav>
    </footer>
  </main>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Hind+Madurai:wght@300;400;500;600;700&family=Montserrat:ital,wght@0,100..900;1,100..900&display=swap");

:root {
  --clr-background: rgb(247, 244, 244);
  --clr-gray: rgb(119, 114, 114);
  --font-main: "Montserrat", sans-serif;
  --clr-dark-gray: #262626;
  --clr-dark-black: #333;
  --clr-dark-text: rgb(226, 225, 225);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

body {
  font-family: "Hind Madurai", sans-serif;
  margin: 0 auto;
  overflow-x: hidden;
}

.wrapper {
  background-color: var(--clr-background);
}

/* -------------------------Header/Navbar */
header {
  font-family: var(--font-main);
  padding-top: 30px;
  width: 100%;
  margin: 0 auto;
}

.navbar {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: 60px;
}

.navbar__ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  list-style-type: none;
  width: 100%;
  max-width: 500px;
}

.navbar__ul .name {
  font-size: 23px;
  font-weight: 600;
}

.navbar__ul a {
  text-decoration: none;
  color: black;
}

.navbar__ul li {
  background: rgba(235, 230, 230, 0.3);
  width: 50%;
  text-align: center;
  margin-top: 2px;
  margin-bottom: 2px;
  padding-top: 5px;
  padding-bottom: 5px;
}

.link,
.portfolio__header,
footer h2 {
  text-transform: uppercase;
}

.header__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 40px;
  margin-bottom: 15px;
  padding-bottom: 2rem;
  margin: 0 auto;
  max-width: 80%;
}

.header__container img {
  width: 70%;
}

.header__text {
  width: 100%;
  margin-top: 20px;
  line-height: 1.5rem;
  text-align: center;
}
/* End of Header/Navbar--------------------- */

/* Portfolio section ----------------------- */
.portfolio,
.portfolio__container {
  display: flex;
}

.portfolio {
  background-color: rgb(238, 237, 237);
  margin-top: 2.5rem;
  padding-top: 3rem;
  flex-direction: column;
  align-items: center;
  width: 100%;
  margin: 0 auto;
}

.portfolio__header {
  font-family: var(--font-main);
  font-size: 2rem;
  margin-bottom: 2.5rem;
}

.portfolio__container {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto;
  place-items: center;
  grid-gap: 0.5rem;
  text-align: center;
  align-items: stretch;
  width: 100%;
  padding: 0.5rem;
}

.card {
  margin: 1rem 0;
  border: 1.5px solid #888;
  padding: 0.5rem;
  gap: 1rem;
  width: 350px;
  max-width: 100%;
  height: 100%;
}

.card img {
  width: 25%;
  margin-bottom: 1rem;
}

.card h2 {
  font-family: var(--font-main);
  font-weight: 700;
  margin-bottom: 0.5rem;
  font-size: 20px;
}

.text-container {
  width: 70%;
  margin: 0 auto;
}

/* End of services------------------------ */

/* Skills --------------------------------- */
.skills {
  text-align: center;
  margin-top: 2rem;
}

.skills h2 {
  font-family: var(--font-main);
  text-transform: uppercase;
  font-size: 2rem;
}

.skills-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 1rem;
  margin-top: 2rem;
  text-align: center;
}

.skills__item {
  margin-bottom: 1rem;
  cursor: pointer;
}

.skills__item img:hover {
  transform: scale(1.1);
  transition: ease-out 0.3s;
}

.skills img {
  max-width: 80px;
  margin-bottom: -5px;
}

/* Footer --------------------------------- */

footer {
  font-family: var(--font-main);
  display: flex;
  flex-direction: column;
  text-align: center;
  width: 100%;
  background-color: var(--clr-background);
}

.footer__nav {
  width: 100%;
  display: flex;
  min-height: 30px;
  padding: 10px;
  bottom: 0;
  text-align: center;
  justify-content: space-between;
}

footer h2 {
  font-size: 2rem;
  margin-top: 2rem;
}

.footer__nav-links {
  display: none;
}

.footer__nav-links li a {
  text-decoration: none;
  color: black;
  text-transform: uppercase;
}

.footer__nav-hr {
  width: 100%;
}

footer p {
  max-width: 400px;
  padding-bottom: 1rem;
  margin: 0 auto;
}

.to-top {
  list-style-type: none;
  margin-right: 10px;
  justify-self: flex-end;
}

.to-top a {
  text-decoration: none;
  color: black;
}

@media screen and (min-width: 768px) {
  .header__container {
    min-width: 600px;
  }

  header {
    padding-bottom: 4rem;
  }

  .navbar {
    width: 100%;
    display: flex;
    bottom: 0;
    justify-content: space-between;
    padding-left: 4rem;
    padding-right: 4rem;
  }

  .navbar ul {
    display: flex;
    flex-direction: row;
  }

  .navbar__ul li {
    padding: 5px 15px 15px 10px;
    background-color: transparent;
  }

  .header__container {
    display: flex;
    flex-direction: row-reverse;
    margin-bottom: 15px;
    align-items: center;
    justify-content: center;
  }

  .header__container img {
    max-width: 300px;
  }

  .header__container p {
    max-width: 350px;
    text-align: left;
  }

  /* Portfolio section at 768----------- */
  .portfolio__container {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    width: 100%;
    max-width: 1165px;
  }

  /* Skills at 768 ------------------- */

  .skills-container {
    flex-direction: row;
    justify-content: center;
    flex-grow: 1;
    width: 100%;
  }

  .skills h2 {
    margin-bottom: -10px;
    text-transform: uppercase;
    font-size: 2rem;
  }

  .skills__item {
    margin-left: 20px;
    margin-right: 20px;
  }

  /* Footer at 768px ---------------- */
  footer {
    display: flex;
    align-items: center;
  }

  .phone,
  .email {
    margin-right: 8px;
  }

  .footer__nav {
    width: 95%;
  }

  .footer__nav h2 {
    text-transform: none;
  }

  .footer__nav-links {
    display: flex;
    flex-direction: row;
    list-style-type: none;
    margin-left: auto;
  }

  .footer__nav-links li {
    padding: 5px 10px 10px 10px;
    text-decoration: none;
  }

  .footer__nav-hr {
    width: 95%;
    border-color: rgb(255, 255, 255);
  }

  .to-top {
    display: none;
  }
}

/* min width 1024 ---------------------------------- */
@media screen and (min-width: 1024px) {
  .navbar,
  .navbar__ul,
  .header__container {
    display: flex;
  }

  .navbar {
    flex-direction: row;
    justify-content: space-between;
  }

  .navbar__ul {
    flex-direction: row;
  }

  .navbar__ul li {
    background-color: transparent;
  }

  .navbar__ul .link {
    margin: 0;
  }

  .header__container {
    flex-direction: row-reverse;
    margin-bottom: 15px;
    align-items: center;
    justify-content: center;
  }

  .header__container img {
    max-width: 330px;
  }

  .header__text {
    max-width: 400px;
    text-align: center;
  }

  /* Portfolio section------------------------- */
  .portfolio__container {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    width: 100%;
  }

  /* End Portfolo------------------------------ */
}

/* Dark mode------------------------------- */
button[class="darkmode"] {
  width: 30px;
  height: 30px;
  cursor: pointer;
  background-color: white;
  border: 1px solid rgb(43, 43, 43);
  border-radius: 50%;
}

.darkmode .portfolio {
  background-color: var(--clr-dark-black);
  color: var(--clr-dark-text);
}

.darkmode footer {
  background-color: var(--clr-dark-black);
  color: var(--clr-dark-text);
}

.darkmode .wrapper {
  background-color: var(--clr-dark-black);
  color: var(--clr-dark-text);
}

.darkmode .navbar__ul li {
  color: var(--clr-dark-text);
  background-color: transparent;
}

.darkmode a[href] {
  color: var(--clr-dark-text);
}

@media screen and (min-width: 1500px) {
  body {
    max-width: 1500px;
  }
}

@media screen and (max-width: 1024px) {
  .portfolio__container {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
}
!

JS 

              
                let btn = document.querySelector(".darkmode");

btn.addEventListener("click", () => {
  if (btn.innerHTML === `<i class="fas fa-moon"></i>`) {
    btn.innerHTML = `<i class="fas fa-sun"></i>`;
    btn.style.color = "orange";
    btn.style.backgroundColor = "rgb(43, 43, 43)";
    document.body.classList.add("darkmode");
  } else {
    btn.innerHTML = `<i class="fas fa-moon"></i>`;
    btn.style.color = "black";
    btn.style.backgroundColor = "white";
    document.body.classList.remove("darkmode");
  }
});
!
999px

Console