style.css

.one, .code-one,
.six,.code-six {
  background-color: #abdee6;
}
.two,.code-two,
.seven,.code-seven {
  background-color: #cbaacb;
}
.three,.code-three,
.eight,.code-eight {
  background-color: #ffffb5;
}
.four,.code-four,
.nine,.code-nine {
  background-color: #ffccb6;
}
.five,.code-five,
.ten,.code-ten {
  background-color: #f3b0c3;
}

body {
  padding: 0;
  margin: 0;
  font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

header {
  background-color: #262626;
  display: flex;
  justify-content: center;
}

header > img {
  height: 80px;
}

h1 {
  text-align: center;
  font-size: 2rem;
  font-weight: 500;
  
}

ul {
  list-style: none;
}

p {
  height: 265px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid;
  margin: 1em 0;
  padding: 1em;
}