html {
  scroll-behavior: smooth;
}

* {
  padding: 0px;
  margin: 0px;
  box-sizing: border-box;
}

body {
  background-color: rgb(78, 86, 104);
  color: rgb(173, 184, 202);
  font-family: "Courier New", Courier, monospace;
  font-size: 20px;
}

header {
  padding: 20px;
  margin-top: 15px;
  margin-bottom: 15px;
  text-align: center;
}

.headernav {
  background-color: rgb(58, 58, 58);
  padding-top: 10px;
  padding-bottom: 10px;
  height: 125px;
}

.aboutnav {
  background-color: rgb(37, 43, 54);
  text-align: center;
  color: whitesmoke;
}

ul li {
  display: inline-block;
}

#a {
  background-color: rgb(58, 80, 100);
  color:rgb(169, 183, 192);
  padding: 15px;
  text-align: center;
}

#b {
  background-color: rgb(37, 43, 54);
  color: rgb(169, 183, 192);
  padding: 15px;
  text-align: center;
}

#c {
  background-color: rgb(58, 80, 100);
  color: rgb(169, 183, 192);
  text-align: center;
  padding: 15px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.44rem;
}

footer {
  background-color: dimgrey;
}

a:link {
  color: whitesmoke;
  background-color: transparent;
  text-decoration: none;
}

a:visited {
  color: whitesmoke;
  background-color: transparent;
  text-decoration: none;
}

a:hover {
  color: whitesmoke;
  background-color: transparent;
  text-decoration: underline;
}

@media screen and (max-width: 600px) {
  .headernav {
    height: 160px;
    transition: all 0.3s ease-in;
  }
  
  img {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
 }
 #c {
  display: grid;
  grid-template-columns: 1fr;
 }
}