*,
*::before,
*::after {
  box-sizing: border-box; // 1
}
ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
a {
  color: #333;
  text-decoration: none;
  background-color: transparent; // remove the gray background on active links in IE 10.
  outline: none;
  cursor: pointer;
  transition: color 0.3s;
}
