The background-color property in CSS is used to set
the background color of an HTML element. It’s one of the most used properties
in CSS and is straightforward to use but has various usecases that are worth
exploring.
1. Basic Usage
The background-color property can be applied to any HTML element, and it will fill the entire background area of the element with the specified color.
Syntax
element { background-color: value; }
1. element: The HTML element you want to apply the background color to (e.g., div, p, body, etc.).
2. value: The color you want to use.
2. What are the values for background-color property?
The background-color property accepts different types of color values:
a. Named Colors
CSS provides a list of predefined color names that can be used directly.
/* Named color example */ div { background-color: red; /* red color */ } p { background-color: lightblue; /* light blue color */ }
b. Hexadecimal Colors
Hex colors start with a # followed by six hexadecimal digits, representing the red, green, and blue components.
/* Hex color example */ h1 { background-color: #ff5733; /* orange */ } section { background-color: #00ff00; /* green */ }
c. RGB Colors
RGB stands for Red, Green, Blue. The values are specified as rgb(red, green, blue).
/* RGB color example */ header { background-color: rgb(255, 255, 0); /* yellow */ }
d. RGBA Colors
RGBA is similar to RGB, but it adds an alpha value that represents the opacity.
/* RGBA color example */ footer { background-color: rgba(0, 0, 255, 0.3); /* 30% transparent blue */ }
e. HSL Colors
HSL stands for Hue, Saturation, and Lightness. It allows for more intuitive color manipulations.
/* HSL color example */ nav { background-color: hsl(120, 100%, 50%); /* bright green */ }
f. HSLA Colors
HSLA is like HSL but includes an alpha value for opacity.
/* HSLA color example */ article { background-color: hsla(240, 100%, 50%, 0.5); /* 50% transparent blue */ }
‘background-color’ is often used in conjunction with other background properties like background-image, background-position, and background-size to create complex background effects.
Example
/* Combining background-color with background-image */ section { background-color: #0000ff; /* Blue background */ background-image: url('pattern.png'); /* Overlay a pattern image */ background-blend-mode: multiply; /* Blend the color and image */ }
When setting a background color, it's crucial to consider the contrast between the background and the text color to ensure readability. A low contrast can make the text difficult to read, especially for users with visual impairments.
Example of Good contrast
/* High contrast for better readability */ .text-box { background-color: black; color: white; }
Example of poor contrast
/* Low contrast that may be hard to read */ .text-box { background-color: lightgrey; color: white; }
backgroundColor.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Contrast Example in CSS</title> <style> /* High contrast for better readability */ .good-contrast { background-color: black; color: white; padding: 20px; margin: 20px 0; font-size: 16px; border-radius: 5px; } /* Low contrast that may be hard to read */ .poor-contrast { background-color: lightgrey; color: white; padding: 20px; margin: 20px 0; font-size: 16px; border-radius: 5px; } /* General styles for both text areas */ .text-box { width: 80%; margin: 20px auto; text-align: center; } </style> </head> <body> <h1 style="text-align: center;">CSS Contrast Examples</h1> <div class="text-box good-contrast"> <p>This is an example of good contrast. The text is easy to read against the background.</p> </div> <div class="text-box poor-contrast"> <p>This is an example of poor contrast. The text is harder to read against the background.</p> </div> </body> </html>
Above snippet generate below screen.
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