h1 {
    text-decoration: underline;
}

a {
    color: orange;
    text-decoration: underline;
}
.highlight {
    background-color: yellow;
}
ul li a,
ol li a {
  color: red;
}

li:first-child{
    font-weight: bold;
}
ul ul li {
    color: blue;
}

ul ul ul li {
    list-style-type: none;
}

ul ul ul li:nth-child(1) {
    color: red;
}

ul ul ul li:nth-child(2) {
    color: green;
}

ul ul ul li:nth-child(3) {
    color: blue;
}