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WordPress relies heavily on the presentation styles within CSS. With the use of Themes, you have an almost infinite choice of layout options. WordPress Themes make it easy to change your website's appearance, and open up the field to help you create your own Theme and page layout.
CSS stands for Cascading Style Sheets. It allows you to store style presentation information (like colors and layout) separate from your HTML structure. This allows precision control of your website layout and makes your pages faster and easier to update.
This article briefly describes the use of CSS in WordPress, and lists some references for further information. For information on CSS itself, see Know Your Sources#CSS.
WordPress Themes use a combination of template files, template tags, and CSS files to generate your WordPress site's look.
Starting with WordPress 4.7, you can now add custom CSS to your own theme from the Appearance Customize Screen, without the need for additional plugins or directly editing themes and child themes. Just choose the Additional CSS tab when customizing your current theme to get started!
Any CSS changes you make will appear in the preview, just like other changes made in the customizer, this means you have time to tweak and perfect the look of your site, without actually changing anything until you are happy with it all!
Keep in mind that the CSS changes are tied in with your theme. This means that if you change to a new theme, your custom CSS styles will no longer be active (of course, if you change back to your previous theme, they will once again be there).
There are a few reasons why:
Several classes for aligning images and block elements (div, p, table etc.) were introduced in WordPress 2.5: aligncenter, alignleft and alignright. In addition the class alignnone is added to images that are not aligned, so they can be styled differently if needed.
The same classes are used to align images that have a caption (as of WordPress 2.6). Three additional CSS classes are needed for the captions, and one more for accessibility. Together, the classes are:
/* =WordPress Core
-------------------------------------------------------------- */
.alignnone {
margin: 5px 20px 20px 0;
}
.aligncenter,
div.aligncenter {
display: block;
margin: 5px auto 5px auto;
}
.alignright {
float:right;
margin: 5px 0 20px 20px;
}
.alignleft {
float: left;
margin: 5px 20px 20px 0;
}
a img.alignright {
float: right;
margin: 5px 0 20px 20px;
}
a img.alignnone {
margin: 5px 20px 20px 0;
}
a img.alignleft {
float: left;
margin: 5px 20px 20px 0;
}
a img.aligncenter {
display: block;
margin-left: auto;
margin-right: auto;
}
.wp-caption {
background: #fff;
border: 1px solid #f0f0f0;
max-width: 96%; /* Image does not overflow the content area */
padding: 5px 3px 10px;
text-align: center;
}
.wp-caption.alignnone {
margin: 5px 20px 20px 0;
}
.wp-caption.alignleft {
margin: 5px 20px 20px 0;
}
.wp-caption.alignright {
margin: 5px 0 20px 20px;
}
.wp-caption img {
border: 0 none;
height: auto;
margin: 0;
max-width: 98.5%;
padding: 0;
width: auto;
}
.wp-caption p.wp-caption-text {
font-size: 11px;
line-height: 17px;
margin: 0;
padding: 0 4px 5px;
}
/* Text meant only for screen readers. */
.screen-reader-text {
border: 0;
clip: rect(1px, 1px, 1px, 1px);
clip-path: inset(50%);
height: 1px;
margin: -1px;
overflow: hidden;
padding: 0;
position: absolute !important;
width: 1px;
word-wrap: normal !important; /* Many screen reader and browser combinations announce broken words as they would appear visually. */
}
.screen-reader-text:focus {
background-color: #eee;
clip: auto !important;
clip-path: none;
color: #444;
display: block;
font-size: 1em;
height: auto;
left: 5px;
line-height: normal;
padding: 15px 23px 14px;
text-decoration: none;
top: 5px;
width: auto;
z-index: 100000;
/* Above WP toolbar. */
}
Each Theme should have these or similar styles in its style.css file to be able to display images and captions properly. The exact HTML elements and class and ID values will depend on the structure of the Theme you are using.
To help you understand more about how CSS works in relationship to your web page, you may wish to read some of the articles cited in these lists:
If you are having some problems or questions about your WordPress Theme or layout, begin by checking the website of the Theme author to see if there is an upgrade or whether there are answers to your questions. Here are some other resources: