Nav
This tag defines the set of navigation links and is only used for the major block of navigation element.

Margin
Margin property is mainly used to create margin around certain elements.

Div
This tag helps define a division or a section in the HTML document.

Text-align
It assigns the horizontal alignment of text in an element.

a
This tag is used to create hyperlinks so helps to link one page with another.

:Hover
The hover selector is used to select the elements when someone hover the mouse over it.

form
This tag is used to collect user information or any user input.

Padding
Padding is mainly used to generate space around the element.