*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f4f9f4;
  color: #212529;
}

h1, h2, h3 {
  margin: 0;
}
