gistfile1.css

html {
  box-sizing: border-box;
}

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

.group:after {
  content: "";
  display: table;
  clear: both;
}

.group div,
.group aside {
  display: inline-block;
  float: left;
}

.group aside {
  padding-left: 20px;
}

.group p {
  width: 448px;
}


body {
  font-family: Arial, sans-serif;
  font-size: 18px;
  margin: 0;
}

header {
  background: thistle;
  padding: 20px 10px;
}

header h1,
section{
  width: 75%;
  margin: 0 auto;
}

img {
  width: 400px;
}

ul {
  list-style-type: none;
  padding-left: 0px;
}

ul li {
  margin: 3px 0;
}

.hide {
  display: none;
}

.ticked {
  color: green;
}