how to css attribute with multiple classes code example

Example 1: css change multiple classes

.objectOne, .objectTwo { /* We will now both be changed */
	margin: 0 auto; 
}

Example 2: css assign multiple classes to one element

To specify multiple classes, separate the class names with a space,
e.g. <span class="classA classB">.
This allows you to combine several CSS classes for one HTML element.