Create a Galaxy Background using HTML/CSS Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report In this article, we will see how to create the galaxy background using the HTML & CSS, along with knowing the basic CSS properties used & will understand it through the example. A galaxy background means a small bunch of circles having different sizes with different shades and a dark background. This task can be accomplished by utilizing the following CSS properties: background-color: This property is used to implement the black-background color to the body element. The background covers the total size of the element with padding and border but excluding margin.border-radius: This property is used to round the corners of the outer border edges of an element. Here, we have used this property to create the circular star-shaped symbol.box-shadow: This property is used to give a shadow-like effect to the frames of an element. The multiple effects can be applied to the element’s frame which is separated by the comma. Here, we have used this property to add the shadow effect to the circular star-shaped symbol.height: This property is used to set the height of the element. Here, we have used this property to add height to the circular star-shaped symbol.width: This property is used to set the width of the element. The width can be assign to the text and images in the form of pixels(px), percentage(%), centimetre(cm) etc. Here, we have used this property to add width to the circular star-shaped symbol.Approach: In order to create the galaxy background, we will define a <div> element and an image, along with having a class as .gfg that will contain the above required styling properties to utilized them to make the stars of different sizes with a dark background. Example: In the below example, we have created a galaxy in the background using the basics of HTML and CSS. HTML <!DOCTYPE html> <html> <head> <title> Galaxy background using HTML & CSS </title> <style> body { background-color: black; } .gfg { top: 60%; left: 40%; bottom: 50%; height: 12px; width: 12px; background-color: white; border-radius: 80%; box-shadow: 34em 54em 3px 4px red, 38vw -4vh 2px 5px lightgreen, -20vw -148vh 8px 4px green, -39vw 38vh 4px 10px pink, -42vw -11vh 4px 13px green, 12vw 15vh 3px 3px grey, 42vw 6vh 3px 2px yellow, -8vw 9vh 0px 2px blue, 34vw -38vh 1px 0px red, -17vw 45vh 3px 1px lightgreen, 22vw -36vh 3px 10px red, -42vw 1vh 1px 0px yellow, 42vw -26vh 3px 10px purple, 36vh 5px 10px red; } </style> </head> <body> <center> <img src= "https://media.geeksforgeeks.org/wp-content/uploads/20210915115837/gfg3.png" alt="GFG image" height="150px" /> <div class="gfg"></div> </center> </body> </html> Output: Comment More infoAdvertise with us A abhishekpal97854368 Follow Improve Article Tags : Web Technologies CSS CSS-Properties HTML-Questions CSS-Questions +1 More Similar Reads CSS Tutorial CSS stands for Cascading Style Sheets. It is a stylesheet language used to style and enhance website presentation. CSS is one of the three main components of a webpage, along with HTML and JavaScript.HTML adds Structure to a web page.JavaScript adds logic to it and CSS makes it visually appealing or 7 min read CSS Introduction CSS (Cascading Style Sheets) is a language designed to simplify the process of making web pages presentable.It allows you to apply styles to HTML documents by prescribing colors, fonts, spacing, and positioning.The main advantages are the separation of content (in HTML) and styling (in CSS) and the 4 min read CSS Syntax CSS is written as a rule set, which consists of a selector and a declaration block. The basic syntax of CSS is as follows:The selector is a targeted HTML element or elements to which we have to apply styling.The Declaration Block or " { } " is a block in which we write our CSS.HTML<html> <h 2 min read CSS Selectors CSS Selectors are used to target HTML elements on your pages, allowing you to apply styles based on their ID, class, type attributes, and more. There are mainly 5 types of selectors.Basic CSS Selectors: These are used to target elements by tag, .class, or # ID for fundamental styling needs.Combinato 7 min read CSS Comments CSS comments are used to add notes or explanations to your code, helping you and others understand it better. They start with /* and end with */ and can be used for both single-line and multi-line comments. Note: Comments are ignored by browsers, so they won’t affect how your webpage looks or works. 2 min read CSS Colors CSS colors are used to set the color of different parts of a webpage, like text, background, and borders. This helps make the page look more attractive and easier to read. You can define colors using names, hex codes, RGB values, and more.You can try different formats of colors here- #content-iframe 5 min read CSS Borders Borders in CSS are used to create a visible outline around an element. They can be customized in terms ofWidth: The thickness of the border.Style: The appearance of the border (solid, dashed, dotted, etc.).Color: The color of the border.You can try different types of borders here- #custom-iframe{ he 5 min read CSS Margins CSS margins are used to create space around an element, separating it from neighboring elements and the edges of the webpage. They control the layout by adjusting the distance between elements, providing better organization and readability.Syntax:body { margin: value;}HTML<html> <head> 4 min read CSS Height and Width Height and Width in CSS are used to set the height and width of boxes. Their values can be set using length, percentage, or auto.Width and HeightThe width and height properties in CSS are used to define the dimensions of an element. The values can be set in various units, such as pixels (px), centim 4 min read CSS Outline CSS outline is a property used to draw a line around an element's border. It does not affect the layout, unlike borders. It's often used to highlight elements, providing a visual emphasis without altering the dimensions of the element.Syntaxselector{ outline: outline-width outline-type outline-color 4 min read Like