body {
  font-family: "Arial", sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f8f9fa;
}

.container {
  max-width: 1400px;
  margin: 20px auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  overflow-y: auto;
}

h1,
h2,
h3,
h4 {
  color: black;
}

h1 {
  font-size: 36px;
  margin-bottom: 20px;
}

h2 {
  font-size: 30px;
  margin-bottom: 15px;
}

h3 {
  font-size: 24px;
  margin-bottom: 10px;
}

h4 {
  font-size: 20px;
  margin-bottom: 5px;
}

p,
li {
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: #007bff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}


.change_color {
  color: red;
}