.netease_mail_readhtml .your-class-name, .netease_mail_readhtml .your-class-name {
/* Replace this comment with your styles */
}
Email is wrapped with class="netease_mail_readhtml". CSS is prefixed with the same but will only apply to the first class in a list. So with this code the first class gets double prefixed, the second one works.
.bloop_container .your-class-name {
/* Replace this comment with your styles */
}
_:-webkit-full-screen, :root .your-class-name {
/* Replace this comment with your styles */
}
@media screen and (pointer) {
.your-class-name {
/* Replace this comment with your styles */
}
}
@media screen and (min-width:0\0) {
.your-class-name {
/* Replace this comment with your styles */
}
}
This broken media query will also show in Outlook 00–03 so you may need to add an IE conditional comment.
_:-webkit-full-screen, :root .your-class-name {
/* Replace this comment with your styles */
}
This won’t render on iOS devices but will render on desktop so may need a max-device-width media query.
_:-webkit-full-screen, :root .your-class-name {
/* Replace this comment with your styles */
}
This won’t render on iOS devices but will render on desktop so may need a max-device-width media query.
.body {
/* Replace this comment with your styles */
}
AOL also removes class from the body tag so you can use .body to avoid AOL.
.Singleton .your-class-name {
/* Replace this comment with your styles */
}
[class^="apple-mail"] .your-class-name {
/* Replace this comment with your styles */
}
Also targets iOS 13.
If the color-scheme is set to light dark or auto then the class is removed and this no longer works.
_:-webkit-full-screen, _::-webkit-full-page-media, _:future, :root .your-class-name {
/* Replace this comment with your styles */
}
@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) and (-webkit-min-device-pixel-ratio: 2), (min-resolution: 2dppx) and (hover: none) {
_:-webkit-full-screen, _::-webkit-full-page-media, _:future, :root body:not(.Singleton) .your-class-name {
/* Replace this comment with your styles */
}
}
Media queries detect the device size to filter out iPhones. Using :not(.Singleton) filters out Apple Mail desktop.
.mail-detail-content .your-class-name {
/* Replace this comment with your styles */
}
Comcast wraps code with class="mail-detail-content". This also targets Libero.
#edo-container .your-class-name {
/* Replace this comment with your styles */
}
Will cover both iOS and Android.
.edo-email-view .your-class-name {
/* Replace this comment with your styles */
}
.edo .your-class-name {
/* Replace this comment with your styles */
}
body[marginwidth][marginheight] .your-class-name {
/* Replace this comment with your styles */
}
#msgBody .your-class-name {
/* Replace this comment with your styles */
}
meta ~ * .your-class-name {
/* Replace this comment with your styles */
}
or
title ~ * .your-class-name {
/* Replace this comment with your styles */
}
The head and body structure of the email is removed, making content in the head, siblings of that in the body, so we can target with this. Applies to Thunderbird, Freenet (title element only), Orange.fr, and Samsung.
@media screen and (max-width: 480px) {
u + .body .gmailmobile {
display: block!important;
}
}
u + .body .your-class-name {
/* Replace this comment with your styles */
}
Gmail changes the doctype to <u></u>. This is placed adjacent to a div that inherits class and id from the body tag.
You must include a doctype tag.
div > u + .body .your-class-name {
/* Replace this comment with your styles */
}
Gmail changes the doctype to <u></u>. This is placed adjacent to a div that inherits class and id from the body tag.
You must include a doctype tag.
@supports (-webkit-overflow-scrolling:touch) and (color:#ffff) {
/* Replace this comment with your styles */
}
u + .body .your-class-name {
/* Replace this comment with your styles */
}
Any class or ID name prefixed with an unsupported character will kill all the styles following it.
body[style*="overflow-wrap:break-word"] {
/* Replace this comment with your styles */
}
@supports (-webkit-overflow-scrolling:touch) and (color:#ffff) {
.your-class-name {
/* Replace this comment with your styles */
}
}
[class^="apple-mail"] .your-class-name {
/* Replace this comment with your styles */
}
Also targets Apple Mail 12.4 on desktop.
If the color-scheme is set to light dark or auto then the class is removed and this no longer works.
@supports (-webkit-overflow-scrolling:touch) and (aspect-ratio: 1 / 1) {
.your-class-name {
/* Replace this comment with your styles */
}
}
-webkit-overflow-scrolling:touch is only supported on mobile devices.
aspect-ratio is not supported on older versions of iOS.
.mail-detail-content .your-class-name {
/* Replace this comment with your styles */
}
Libero wraps code with class="mail-detail-content". This also targets Comcast.
#cm_mail_smart_body .your-class-name {
/* Replace this comment with your styles */
}
.body > div > div > .wrapper .your-class-name {
/* Replace this comment with your styles */
}
Nine inserts a couple of divs between the body and the wrapper. Same hack also targets Samsung and possibly others.
.unused.your-class-name {
/* Replace this comment with your styles */
}
Notes 8 will strip the unrecognised class and render the code behind it.
.your-class-name[class^="ox-"] {
/* Replace this comment with your styles */
}
Open-Xchange powers a number of different email clients including Comcast, Libero, 1&1 MailXchange, Network Solutions Secure Mail, Namecheap Email Hosting, Mailbox.org, 123-reg Email, acens Correo Professional, Home.pl Cloud Email Xchange, Virgin Media Mail, and Ziggo Mail.
They prefix class and ID names with ox- so we can target them with this.
meta ~ * .your-class-name {
/* Replace this comment with your styles */
}
or
title ~ * .your-class-name {
/* Replace this comment with your styles */
}
The head and body structure of the email is removed, making content in the head siblings of that in the body, so we can target with this. Applies to Thunderbird, Freenet (title element only), Orange.fr, and Samsung.
<!--[if mso | ie]>
<td>ALL OUTLOOK</td>
<![endif]-->
<!--[if mso 9]>
<td>OUTLOOK 2000</td>
<![endif]-->
<!--[if mso 10]>
<td>OUTLOOK 2002</td>
<![endif]-->
<!--[if mso 11]>
<td>OUTLOOK 2003</td>
<![endif]-->
<!--[if mso 12 | mso 14 | mso 15 ]>
<td>OUTLOOK 2007/10/13</td>
<![endif]-->
<!--[if mso 12]>
<td>OUTLOOK 2007</td>
<![endif]-->
<!--[if mso 14]>
<td>OUTLOOK 2010</td>
<![endif]-->
<!--[if mso 15]>
<td>OUTLOOK 2013</td>
<![endif]-->
<!--[if mso 16]>
<td>OUTLOOK 2016</td>
<![endif]-->
<!--[if mso 16]>
<td>WINDOWS 10 MAIL</td>
<![endif]-->
@media (min-resolution: 1dpi) {
body[data-outlook-cycle] .your-class-name {
display: block!important;
}
}
[data-ogsc] .your-class-name {
/* Replace this comment with your styles */
}
When changing a color style in dark mode, Outlook will add data-ogsc to the element. When changing a background-color style in dark mode, Outlook will add data-ogsb to the element.
This requires adding styles that Outlook will change to a wrapping element.
[data-outlook-cycle*="INSERT_STYLES"] .your-class-name {
/* Replace this comment with your styles */
}
Where it says "INSERT_STYLES" you need to keep that text as it is and not actually insert your styles.
This will target only non-Microsoft email addresses (@hotmail, @live, @outlook, etc).
.your-class-name\0{
/* Replace this comment with your styles */
}
The \0 gets removed as part of the HTML cleanup. Be aware that Gmail will remove a style block with this code, so it needs to be included in a separate <style> block.
This can also be added directly to a style, like .your-class-name { background: red\0/; }.
body[data-outlook-cycle] .your-class-name {
/* Replace this comment with your styles */
}
This attribute is added to both iOS and Android apps. It also renders in webmail if you drop the body tag and just use the attribute.
.olm-fragment-custom .your-class-name {
/* Replace this comment with your styles */
}
This must be placed in a <style> block placed inside the <body> of the email. It won’t work if placed in the <head>.
_:-webkit-full-screen, _::-webkit-full-page-media, _:future, :root body:not(.Singleton) .your-class-name {
/* Replace this comment with your styles */
}
The stuff before .body will target WebKit desktop apps on Mac (Apple Mail and Outlook Mac), then we add :not(.Singleton) to remove Apple Mail.
This also targets Spark desktop app.
Note that this will not work for non-Outlook accounts.
@media (display-mode: standalone) {
[class~=""x_your-class-name""] {
/* Replace this comment with your styles */
}
}
Outlook PWA supports the same targeting as Outlook.com and Outlook apps. However, its display-mode is set to standalone so we can target it with the display-mode media query.
[class~="x_your-class-name"] {
/* Replace this comment with your styles */
}
Outlook.com prefixes class names with x_ but doesn’t do this on attribute selectors. So <div class="your-class-name"> can be targeted with [class="x_your-class-name"] and it’ll only apply to Outlook.
[owa].your-class-name x:default .your-class-name {
/* Replace this comment with your styles */
}
.moz-text-html .your-class-name {
/* Replace this comment with your styles */
}
#secdiv {
/* Replace this comment with your styles */
}
meta ~ * .your-class-name {
/* Replace this comment with your styles */
}
or
title ~ * .your-class-name {
/* Replace this comment with your styles */
}
#MessageViewBody {
/* Replace this comment with your styles */
}
.body > div > div > .wrapper .your-class-name {
/* Replace this comment with your styles */
}
Samsung inserts a couple of divs between the body and the wrapper. Same hack as Nine.
body[style="overflow-y:hidden;width:auto !important; font-family: sans-serif"] .your-class-name {
/* Replace this comment with your styles */
}
Email is opened in an iframe and these styles are added to the body.
blockquote[data-color] + .your-class-name {
/* Replace this comment with your styles */
}
By adding blockquote before the targetted class, we can hook into the appended data-color attribute to access it.
_:-webkit-full-screen, _::-webkit-full-page-media, _:future, :root .body:not(.Singleton) {
/* Replace this comment with your styles */
}
Same target as Outlook for macOS.
<!--[if tonline]> T-Online <![endif]-->
<!--[if false]> T-Online <![endif]-->
<!--[if !true]> T-Online <![endif]-->
Supports any conditional comment.
@media screen and (-moz-device-pixel-ratio) {
.your-class-name {
/* Replace this comment with your styles */
}
}
meta ~ * .your-class-name {
/* Replace this comment with your styles */
}
or
title ~ * .your-class-name {
/* Replace this comment with your styles */
}
The head and body structure of the email is removed, making content in the head siblings of that in the body, so we can target with this. Applies to Thunderbird, Freenet (title element only), Orange.fr, and Samsung.
.moz-text-html .your-class-name {
/* Replace this comment with your styles */
}
This class is placed on a div inserted between the body and the wrapper so you can also do something like body > div > .wrapper .your-class-name.
_:-ms-input-placeholder, :root .your-class-name {
/* Replace this comment with your styles */
}
_:-ms-fullscreen, :root .your-class-name {
/* Replace this comment with your styles */
}
.your-class-name {
background:/* red */;
font-size: /* 50px */;
color: /* white */;
}
Yahoo and AOL will remove comment markers inside a style and render the content left behind.
.& .your-class-name {
/* Replace this comment with your styles */
}
Yahoo and AOL will replace the .& with their wrapping ID name. It can also be used to target element selectors (like .&h1{
/* Replace this comment with your styles */
}) and the wrapping div itself (with .&{
/* Replace this comment with your styles */
}).
@media screen yahoo{
.your-class-name {
/* Replace this comment with your styles */
}
}
Yahoo & AOL remove invalid media query selectors so will render the above as @media screen { }. Yahoo doesn’t support max-device-width which makes it tricky to split mobile but we can use max-width.
Be sure to keep the space between yahoo and {. If you use it without a space (yahoo{) then it may also render some of the code in Outlook.com.
id="★your-id-name"
AOL will strip this out but Yahoo will leave it. AOL also strips <title> and empty <style> elements.
.your-class-name {
background: red !yahoo
}
Add !yahoo after a style. (This could be any word.)
This will also render on some older versions of Notes.
<noscript>
<style>
.& .your-class-name {
/* Replace this comment with your styles */
}
</style>
</noscript>
Although it’s run as a separate company, the same targeting works for Yahoo Japan and Yahoo.com. However, Yahoo Japan displays the email in a sandboxed iframe and we can separate it with a noscript tag that Yahoo.com will ignore.
Need help? Can't find what you’re looking for?
Start a discussion on the GitHub repo or ask the #email-code channel on Email Geeks Slack.