*{
    font-family: arial;
}

h2 {
    text-align: center;
}

a:link {
    text-decoration: none;
}

a:hover {
    color: orangered;
}

a:active {
    color: lawngreen;
}

a:visited {
    color: red;
}

input[type="checkbox"]:checked {
    outline: 2px solid blue;
}

input[type="text"]:disabled {
    background-color: lightgray;
}

#cool:focus {
    background-color: aqua;
}

p:nth-child(3) {
    color: orangered;
}