main {
  width: 400px;
  margin: 100px auto 0;
}

ul {
  margin: 0;
  padding: 0;
}

li * {
  float: left;
}

li, h3 {
  clear: both;
  list-style: none;
}

input, button {
  outline: none;
}

button {
  background: none;
  border: 0px;
  color: #888;
  font-size: 15px;
  width: 60px;
  margin: 10px 0 0;
  cursor: pointer;
}

button:hover {
  color: #333;
}

h3,
label[for='new-task'] {
  color: #333;
  font-weight: 700;
  font-size: 15px;
  border-bottom: 2px solid #333;
  padding: 30px 0 10px;
  margin: 0;
  text-transform: uppercase;
}

input[type="text"] {
  margin: 0;
  font-size: 18px;
  line-height: 18px;
  height: 18px;
  padding: 10px;
  border: 1px solid #ddd;
  background: #fff;
  border-radius: 6px;
  color: #888;
}

input[type='text']:focus {
  color: #333;
}

label[for='new-task'] {
  display: block;
  margin: 0 0 20px;
}

input#new-task {
  float: left;
  width: 318px;
}

li {
  overflow: hidden;
  padding: 20px 0;
  border-bottom: 1px solid #eee;
}

li > input[type='checkbox'] {
  margin: 0 10px;
  position: relative;
  top: 15px;
}

li > label {
  font-size: 18px;
  line-height: 40px;
  width: 237px;
  padding: 0 0 0 11px;
}

li > input[type='text'] {
  width: 226px;
}

li > .delete:hover {
  color: #CF2323;
}

#completed-tasks label {
  text-decoration: line-through;
  color: #888
}

li input[type='text'] {
  display: none;
}

li.editMode input[type='text'] {
  display: block;
}

li.editMode label {
  display: none;
}

Complete first pass CSS from example
Complete first pass CSS from example
