index.css

* {
  margin: auto;
  padding: auto;
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

a {
  text-decoration: none;
  color: white;
}
li {
  list-style: none;
}

/* header */
.header {
  background-color: #222;
  display: flex;
  justify-content: space-between;
}

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

.header .logo .logo-img a img {
  display: flex;
  width: 50px;
}
.header .logo .logo-text {
  margin-left: 5px;
}
.header .logo .logo-text a {
  display: block;
  padding: 15px 20px;
  font-size: 16px;
}

.header .logo .logo-text a:hover {
  color: #aaa;
}

.header .nav {
  display: flex;
  justify-content: space-around;
}

.header .nav li {
  margin: 5px;
}

.header .nav li a {
  display: block;
  padding: 15px 20px;
  font-size: 16px;
}

.header .nav li a:hover {
  color: #bbb;
}

/* main section */
.main {
  background-color: #aaa;
  min-height: 70vh;
}

/* card-gallery */
.card-gallery {
  display: flex;
  align-items: center;
  justify-content: center;
}

.card {
  display: inline-block;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  transition: 0.3s;
  width: 300px;
  margin: 20px auto;
  border-radius: 10px;
}

.card:hover {
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
}

.card-body {
  padding: 20px;
}

.card-title {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 20px;
}

.card-text {
  font-size: 14px;
  line-height: 1.5;
  color: #444;
  margin-bottom: 20px;
}

.btn {
  padding: 10px 20px;
  border-radius: 20px;
  background-color: #222;
  color: #fff;
  text-decoration: none;
  transition: all 0.3s ease;
}



.btn:hover {
  color: #333;
  background-color: #fff;
}

/* Footer section */
.footer {
  background-color: #222;
  color: #fff;
  padding: 30px 150px;
}

.footer .row{
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Footer headings */
.footer h3 {
  font-weight: bold;
}

/* Footer social icons */
.footer .social-icons li a {
  font-size: 18px;
  display: inline-block;
  width: 40px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  border-radius: 50%;
  transition: all 0.3s ease;
}

.footer .social-icons li a:hover {
  color: #333;
  background-color: #fff;
}

/* Footer copyright */
.footer .copyright{
  margin-top: 30px;
}
.footer .text-center {
  text-align: center;
}

.footer .small {
  font-size: small;
}