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

body {
  font-family: sans-serif;
  line-height: 1.6;
  font-size: 14px;
}

a {
  text-decoration: none;
  color: #fff;
}

ul {
  list-style: none;
}

img {
  width: 100px;
  border-radius: 50%;
}

.container-bg {
  background-color: #000;
  color: #fff;
  min-height: 100vh;
}

#container-sm {
  width: 300px;
  margin: 0 auto;
  padding: 1.5rem;
  display: block;
  text-align: center;
  background-color: hsl(0, 0%, 8%);
  border-radius: 8px;
}

header h1 {
  margin-top: 0.5rem;
  font-size: 1.3rem;
  font-weight: 600;
}

header p {
  color: hsl(75, 94%, 57%);
}

.lead-paragraph {
  margin: 1rem 0 1.3rem;
  color: hsl(0, 0%, 70%);
}

.nav-links a {
  display: block;
  width: 100%;
}

.nav-links a {
  background-color: hsl(0, 0%, 12%);
  margin: 0.6rem 0;
  padding: 0.5rem;
  border-radius: 8px;
  cursor: pointer;
}

.nav-links a:hover {
  background: hsl(75, 94%, 57%);
  transition: 0.3s ease-in-out;
  color: hsl(0, 0%, 0%);
}

@media screen and (max-width: 576px) {
  .container-bg {
    max-width: 900px;
    height: 100vh;
    margin: 0 1rem;
    padding: 4rem 2rem;
  }

  #container-sm {
    width: 280px;
    padding: 1.5rem;
  }

  .lead-paragraph {
    font-size: 13px;
  }
}