/* Applies to the entire body of the HTML document (except where overridden by more specific
selectors). */
body {
    margin: 25px;
    background-color: rgb(240,240,240);
    font-family: Aptos, "Segoe UI", Tahoma, Arial, sans-serif;
    font-size: 14px;
    width: 500px;
}

/* Applies to all <h1>...</h1> elements. */
h1 {
    font-size: 24px;
    font-weight: normal;
    margin-top: 5px;
}

/* Applies to all elements with <... class="someclass"> specified. */
.someclass {
    color: red;
}

/* Applies to the element with <... id="someid"> specified. */
#someid {
    color: green;
}