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

html {
  scroll-behavior: smooth;
}

body {
  padding: 20px;
  padding-top: 40px; 
  margin: 5%;
  background-color: #f5f5f5;
  color: #333;
}

header,
footer {
  text-align: center;
  margin-bottom: 20px;
}

@media (max-width: 400px) {
  header {
    margin-top: 20px;
  }
}