index.css

@import url('https://fonts.googleapis.com/css2?family=Lato:wght@400;900&display=swap');

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

body {
  background-color: rgb(0, 0, 0);
}

.logo {
  height: 100px;
}

.main {
  background-image: url("BITS%20Cover.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  font-family: 'Lato', sans-serif;
  color: honeydew;
  width: 100%;
  height: 100%;
  font-size: 20px;
  padding-top: 10%;
  margin: auto;
  text-align: center;
  text-shadow: 0 0 10px black;
}

h2 {
  background-color: rgba(255, 255, 255, 0.267);
  font-weight: bold;
  color: aqua;
}

.main h1 {
  font-size: 100px;
  
  margin: auto;
  text-align: center;
}

.icon-down a span {
  color: white;
  margin-top: 40px;
  padding: 20px;
  border-radius: 30%;
  transition: 0.5s;
}

.icon-down a span:hover {
  background: #007bff;
  border-radius: 50%;
}

.info {
  font-family: 'Lato', sans-serif;
  font-weight: 400;
  color: honeydew;
  width: 100%;
  height: 30%;
  padding: 10rem;
  text-align: center;
  background-color: rgba(0, 123, 255, 0.4);
}

.description h6 {
  font-size: 2rem;
}


:root {
  --primary-color: rgb(226, 226, 226);
  --secondary-color: #818cab;
  --font-color: #ffffff;
  --bg-color: #00000f;
  --heading-color: #000a2b9a;
}

[data-theme="dark"] {
  --primary-color: rgb(32, 32, 32);
  --secondary-color: #2c2c2c;
  --font-color: #202020;
  --bg-color: rgb(226, 226, 226);
  --heading-color: #dddddd;
}

.logo {
  height: 100px;
}

#dark-light {
  color: white;
}

nav ul {
  list-style: none;
  padding: 0;
  background-color: rgb(52, 58, 64)!important;
  text-align: center;
}

nav ul li a {
  color: var(--bg-color);
  text-decoration: none;
  padding: .8rem 1rem;
  display: block;
  line-height: 1;
}

nav ul li {
  
  border-bottom: 1px dotted #ddd;
}

nav div:first-child {
  background: var(--primary-color);;
}

nav div:first-child h1 {
  line-height: 0;
  padding: .8rem 0rem;
  text-align: center;
}

nav div:first-child h1,
nav ul {
  margin: 0;
}

@media only screen and (min-width:30em) {
  nav {
    display: flex;
    justify-content: space-between;
    background-color: var(--primary-color);
    align-items: center;
  }

  nav ul {
    display: flex;
    align-items: center;
    background: none;
    flex-wrap: wrap;
  }

  nav div:first-child h1 {
    padding: 0;
    margin-left: 1rem;
  }

  nav div:first-child img {
    height: 120px;
  }

  nav ul li {
    border-bottom: none;
    flex: 1 0 auto;
    position: relative;
  }


  nav ul li a {
    padding: 1.2rem 1rem
  }

  nav ul li a::before,
  nav ul li a::after {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0%;
    height: 2px;
    background: cyan;
    transition: .2s width ease-in-out;
  }

  nav ul li a::before {
    left: 0;
  }

  nav ul li a:hover::after,
  nav ul li a:hover::before {
    width: 50%;
  }
}

@media only screen and (max-width: 576px) {
  .description h6 {
    font-size: 1rem;
  }

  .info {
    padding: 2rem;

  }

  .team {
    padding: 2rem 5rem;
  }

}