background-color, border, float, font, width
Background-color is the color of the background of an element.
Border is the property that is used for border-color, border-style, and border width.
Float is the property that determines if an element floats to the left, right, or does not float at all.
Font is a property that determines the font-family, font-size/line-height, font-weight, font-variant, and font-style.
Width is how the size of an element is adjusted and is used to determine how wide an element is.
Responsive Design is creating is creating web pages that look well done on all electronic devices such as computers, phones, and tablets. Well done responsive web design will automatically adjust and fit any electronic device. Great web design is appealing to the eye.