margin-bottom

The margin-bottom CSS property of an element sets the margin space required on the bottom of an element. A negative value is also allowed.
This property has no effect on non-replaced inline elements, like <tt> or <span>

Example

<!DOCTYPE html>
<html>
    <head>
        <style>
            .margin1 {
                margin-bottom: 5%;
            } .margin2 {
                margin-bottom: 10px;
            } .margin3 {
                margin-bottom: -5px;
            } .margin4 {
                margin-bottom: 1em;
            }
        </style>
    </head>
    <body>
        <div class="margin1">
            The quick brown red fox jumps over the lazy dog
        </div>
        <div class="margin2">
            The quick brown red fox jumps over the lazy dog
        </div>
        <div class="margin3">
            The quick brown red fox jumps over the lazy dog
        </div>
        <div class="margin4">
            The quick brown red fox jumps over the lazy dog
        </div>
    </body>
</html>