Responsive web design


Bootstrap Media queries (key breakpoints in Bootstrap grid system):

/* Extra small devices (phones, less than 768px) */
@media (max-width: 767px) {

/* Small devices (tablets, more than 768px and less than 992px) */
@media (min-width: 768px) and (max-width: 991px) {

/* Medium devices (desktops, more than 992px and less than 1200px) */
@media (min-width: 992px) and (max-width: 1199px) {

/* Large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {

@media (min-width: 768px) {
	.container {
		width: 750px;
@media (min-width: 992px) {
	.container {
		width: 970px;
@media (min-width: 1200px) {
	.container {
		width: 1170px;

Paste the following lines within the [head] and [/head] tags on your html page. This will set the view on all screens at a 1×1 aspect ratio and remove the default functionality from iPhones and other smartphone browsers which render websites at full-view and allow users to zoom into the layout by pinching.

<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="HandheldFriendly" content="true">

This css code will hide sidebar if your browser width is lower than 480px or if your device width is lower than 480px:

@media screen and (max-width: 480px), screen and (max-device-width: 480px) {
	.sidebar {display:none;}

Or import css styles with same conditions:

@import url("narrow.css") screen and (max-width: 480px), screen and (max-device-width: 480px);

Or add css file into document with same conditions:

<link href="narrow.css" media="screen and (max-width: 480px), screen and (max-device-width: 480px)" rel="stylesheet" />

Or add css file into document with width range:

<link href="medium.css" media="screen and (min-width: 701px) and (max-width: 900px)" rel="stylesheet" />

height, width, min-width, max-width, min-height, max-height - is the width or height of the target display area, e.g. the browser.
device-width, device-height, min-device-width, max-device-width, min-device-height, max-device-height - is the width or height of the device's entire rendering area, i.e. the actual device screen.
Combinations with width:

@media screen (min-device-width: 320px) and (max-device-width: 480px), screen (min-width: 320px) and (max-width: 480px) { ... }

Other parameters:

@media screen and (orientation:portrait) { ... }
@media screen and (orientation:landscape) { ... }
@media screen and (device-aspect-ratio: 16/9) { ... }
@media screen and (color) { /* Screen is in color */ }
@media screen and (min-color-index: 256) { /* Screen has at least 256 colors */ }
@media screen and (monochrome) { /* Screen is monochrome */ }
@media screen and (resolution: 163dpi) { ... }

Media Types:

Media Type Description
all Used for all media type devices
aural Used for speech and sound synthesizers
braille Used for braille tactile feedback devices
embossed Used for paged braille printers
handheld Used for small or handheld devices
print Used for printers
projection Used for projected presentations, like slides
screen Used for computer screens
tty Used for media using a fixed-pitch character grid, like teletypes and terminals
tv Used for television-type devices

This code is using css3 media queries. This is good for creating mobile version of your site for comfortable viewing it on iPhone or Android. Also this is good for creating different styles depending on the screen width.

Responsive Media

img { max-width: 100%; }

3 thoughts on “Responsive web design”

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