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: The period indicates it is a class selector , meaning it will affect any HTML element that includes class="mBRzrMxE" .
This rule applies the vertical-align property with the value top : .mBRzrMxE { vertical-align:top
: This property only works on inline , inline-block , or table-cell elements. : The period indicates it is a class
To apply this style, you must link the CSS to your HTML and assign the class to an element: CSS vertical-align property - W3Schools .mBRzrMxE { vertical-align:top