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Specifying Color

By Stephen Bucaro

The value for the color property can be specified by one of four different methods, by color name, by using the rgb macro, or by using hexadecimal notation.

Color Name

You can specify the color name as shown below.

h1 {color: red;}

The problem with this method is, unless you're using a basic color, it's difficult to remember the color names defined in the CSS specification.

rgb Macro

Colors are created on a computer by mixing varying amounts of the basic colors red, green, and blue, referred to as "rgb" colors. You can specify the amount of each basic color by percentage. The example below defines the color red by specifying 100% for the red component, and 0% for the green and blue components.

h1 {color: rgb(100%,0%,0%);}

The computer has to convert these percentages to 16 bit binary values. The highest 16 bit binary value is 255; therefore, 50% would be converted to 127. Your webpage will load slightly faster if you enter color values from 0 to 255 rather than as percentages, as shown blow.

h1 {color: rgb(255,0,0);}

Hexadecimal Notation

The computer still has to convert these decimal values to binary numbers. Binary numbers can be represented in hexadecimal notation. Whereas a decimal digit can be one of ten different values from 0 to 9, a hexadecimal digit can be one of 16 different values from 0 to f (after 9 - a, b, c, d, e and f are used).

The example below shows how a pound sign (#) is used to indicate that the color is being specified in hexadecimal notation.

h1 {color: #ff0000;}

Once the color value is specified, it can be used to set the color of an element on a webpage. The example below sets the color property to green for both the text in the paragraph, and the border around the paragraph.

<p style="color: green; border: solid;">
We the people of the United States, in order to form
a more perfect union, establish justice, insure
domestic tranquility, provide for the common defense,
promote the general welfare, and secure the blessings
of liberty to ourselves and our posterity, do ordain
and establish this Constitution for the United States
of America.</p>

To set a different color for the text and the border, you could place the paragraph inside a div and set a different color property for the paragraph and div, as shown below.

<div style="color: blue; border: solid;">
<p style="color: green;">
We the people of the United States, in order to form
a more perfect union, establish justice, insure
domestic tranquility, provide for the common defense,
promote the general welfare, and secure the blessings
of liberty to ourselves and our posterity, do ordain
and establish this Constitution for the United States
of America.</p></div>

The "background-color" property specifies the background color of an element on a webpage. The example below sets the background-color property for the paragraph to yellow.

<p style="background-color: yellow;">
We the people of the United States, in order to form
a more perfect union, establish justice, insure
domestic tranquility, provide for the common defense,
promote the general welfare, and secure the blessings
of liberty to ourselves and our posterity, do ordain
and establish this Constitution for the United States
of America.</p>

More CSS Quick Reference:
• Highlight Text
• Use Inline Style
• Set the Background Properties
• Set the Line Spacing
• Use an External Style Sheet
• Set the border-collapse
• Set the box-sizing Property
• CSS background-origin Positions Background
• position:absolute
• Set an Element's Float