styles.css

body {
  background-color: lightblue;
}

h1 {
  color: black;
  font-family: "Gill Sans", sans-serif !important;
  text-align: center;
  font-size: 48px;
}

p {
  color: darkgray;
  font-family: "Gill Sans", sans-serif !important;
  font-size: 20px;
}
.topnav {
  overflow: hidden;
  background-color: #e9e9e9;
}

.topnav a {
  float: center;
  display: block;
  color: black;
  text-align: center;
  padding: 18px 20px;
  text-decoration: none;
  font-size: 17px;
  color: black;
  font-family: "Gill Sans", sans-serif !important;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav a.active {
  background-color: #2196F3;
  color: white;
}

.search input[type=text] {
  float: center;
  padding: 12px;
  border: none;
  margin-top: 4px;
  margin-right: 8px;
  font-size: 17px;
  width: 90%;
  color: black;
  font-family: "Gill Sans", sans-serif !important;
}

@media screen and (max-width: 600px) {
  .topnav a, .topnav input[type=text] {
    float: center;
    display: block;
    text-align: left;
    width: 100%;
    margin: 0;
    padding: 12px;
  }
  .topnav input[type=text] {
    border: 1px solid #ccc;
  }
}