css
/* styles.css */
body {
  background: #f0f0f0;
  font-family: "Helvetica Neue", Arial, sans-serif;
  line-height: 1.2;
  margin: 0;
  padding: 0;
}

body * {
  box-sizing: border-box;
}

h1, h2, h3 {
  font-weight: bold;
  text-align: center;
  margin: 0;
  padding: 0;
  font-family: "Helvetica Neue", Arial, sans-serif;
}

h1 {
  font-size: 24px;
  border-bottom: 4px solid #000;
}

h2, h3 {
  font-size: 20px;
  border-bottom: 2px solid #000;
}

body > * {
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.5);
}

body, html {
  font-size: 16px;
  overflow-x: hidden;
  width: 800px;
  margin: 0 auto;
  padding: 20px;
  background: #f7d7d7;
  color: #000;
  border: 1px solid #000;
  box-sizing: border-box;
}

a {
  text-decoration: none;
  color: #000;
  font-weight: bold;
  text-transform: uppercase;
  transition: all 0.2s ease;
  border-bottom: 2px solid #000;
  padding: 5px 10px;
  border-radius: 2px 2px 0 0;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  display: inline-block;
  margin: 0 10px 0 0;
  transition: all 0.2s ease;
  font-size: 16px;
  color: #000;
}

a:hover {
  background: #000;
  color: #fff;
  border-bottom: 2px solid #000;
  box-shadow: 0 0 0 4px #000;
}

a:visited {
  color: #000;
  text-decoration: none;
  transition: all 0.2s ease;
}

a:active {
  color: #000;
  background: #000;
  text-decoration: none;
  border-bottom: 2px solid #000;
  box-shadow: 0 0 0 4px #000;
  transition: all 0.2s ease;
}

h4, .h4, h4 > * {
  font-weight: bold;
  margin: 20px 0 10px 0;
  border-bottom: 4px solid #000;
}

h4 > * {
  font-weight: bold;
  margin: 20px 0 10px 0;
  border-bottom: 4px solid #000;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 2px;
  line-height: 1.2;
  font-size: 16px;
  font-style: normal;
  text-align: center;
  text-transform: uppercase;
  color: #000;
  border-bottom: 4px solid #000;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  padding: 5px 10px;
  border-radius: 2px 2px 0 0;
  transition: all 0.2s ease;
}

.h4 > a {
  font-size: 18px;
  color: #000;
  text-decoration: none;
  transition: all 0.2s ease;
  border-bottom: 4px solid #000;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  padding: 0 10px;
  border-radius: 2px 2px 0 0;
  display: inline-block;
  margin: 0 10px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 2px;
  line-height: 1.2;
  color: #000;
  border-bottom: 4px solid #000;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  padding: 0 10px;
  border-radius: 2px 2px 0 0;
  transition: all 0.2s ease;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 2px;
  line-height: 1.2;
  color: #000;
  border-bottom: 4px solid #000;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  padding: 0 10px;
  border-radius: 2px 2px 0 0;
  display: inline-block;
  margin: 0 10px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 2px;
  line-height: 1.2;
  color: #000;
  border-bottom: 4px solid #000;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  padding: 0 10px;
  border-radius: 2px 2px 0 0;
  transition: all 0.2s ease;
}

.h4 > a:visited {
  color: #000;
  text-decoration: none;
  transition: all 0.2s ease;
  border-bottom: 4px solid #000;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  padding: 0 10px;
  border-radius: 2px 2px 0 0;
  display: inline-block;
  margin: 0 10px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 2px;
  line-height: 1.2;
  color: #000;
  border-bottom: 4px solid #000;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  padding: 0 10px;
  border-radius: 2px 2px 0 0;
  transition: all 0.2s ease;
}

.h4 > a:active {
  color: #000;
  background: #000;
  text-decoration: none;
  border-bottom: 4px solid #000;
  box-shadow: 0 0 0 2px #000;
  padding: 0 10px;
  border-radius: 2px 2px 0 0;
  display: inline-block;
  margin: 0 10px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 2px;
  line-height: 1.2;
  color: #000;
  border-bottom: 4px solid #000;
  background: #fff;
  box-shadow: 0 0 0 2px #000;
  padding: 0 10px;
  border-radius: 2px 2px 0 0;
  transition: all 0.2s ease;
}