html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

html {
  position: relative;
  min-height: 100%;
}

body {
  background-color: #3498db;
  font-family: Arial;
  color: white;
  text-align: center;
}

ul {
  list-style-type: none;
  max-width: 300px;
  margin: 20px auto;
}

li {
  min-height: 20px;
  text-align: left;
  background-color: white;
  color: #444;
  padding: 5px;
  margin-bottom: 5px;
}

li button {
  float: right;
  margin: 0px 3px;
}

.checked {
  text-decoration: line-through;
}