I am currently wondering which is the best CSS property to use, Opacity or RGBa? More specifically I am trying to recreate something similar to the famous BBC Home page slider, and it got me thinking why they use Opacity.
In my version I have came across using the following two versions of code:
.left-button {
background: rgb(255, 255, 255) url('../images/left-arrow.png') no-repeat; //FALLBACK
background: rgba(255, 255, 255, 0.4) url('../images/left-arrow.png') no-repeat;
}
or
.left-button {
background: #fff url('../images/left-arrow.png') no-repeat; //FALLBACK
opacity: 0.4;
}
Obviously the second one makes the actual button image opaque too, which is why I assume the BBC has made separate buttons and background masks for the buttons (which in my opinion is unnecessary additional markup).
I'd like to use the first version with RGBa though. Would anyone care to point out why one is better than the other and if there is any compatibility issues I am unaware of?
Opacity is inherited to all child items, RGBa is not. If a child item has a lesser or no opacity, use RGBa.
IE8 and lower does not support RGBa, so you may need an opacity back-up plan.
Neither one is "better" because they do different things, so it depends on what you're trying to accomplish.
opacity sets the opacity for the entire element and all of its contents (text, inline images, etc). RGBa is a way to define a color with a certain level of alpha transparency.
So let's say you have a div:
<div>Hello!</div>
This will make the entire div and its contents ("Hello!") 50% opaque:
div {
background: #000;
color: #fff;
opacity: 0.5;
}
Whereas this will make just the background of the div 50% opaque, while leaving the text at 100% opaque pure white:
div {
background: rgba(0, 0, 0, 0.5);
color: #fff;
}
Related
I am at my first year programming and just learning Java this is why I am completly lost with CSS and need help.
I want to edit this code (not mine)
===== CUSTOMIZABLE COLORS =====
:root {
main-color: #057F95;
hover-color: #045B6B;
}
===== CUSTOMIZABLE IMAGES =====
IMPORTANT: EVERY URL MUST BE HTTPS:// IN ORDER TO WORK IN DISCORD
RECOMMENDATIONS: EVERY URL AT THE BOTTOM SHOULD BE THE SAME TO MAKE THE
tHEM MATCH. (YOUR CHOICE)
/*Change the url in .app to change the background behind chat */
.app { background-image: url("https://imgur.com/RG03PyX.png") !important;
background-size: cover !important; }
/*Change the url in .callout-backdrop to change the background when modal pop outs happen */
.callout-backdrop { background-color: black !important; background-image: url("https://imgur.com/RG03PyX.png") !important; -webkit-transition: 0.3s all ease; -o-transition: 0.3s all ease; -moz-transition: 0.3s all ease; transition: 0.3s all ease; background-size: cover !important; -webkit-filter: brightness(75%); }
/*Change the urls below to change the background of a profile modal pop up */
.user-popout:before {
background-image: url("https://imgur.com/RG03PyX.png") !important;
content: "";position: absolute;left: 0;top: 0;height: 100%;width: 100%;z-index: -1;background-position: 50% 50%;-webkit-filter: blur(3px);-webkit- transform: scale(1.05);transform: scale(1.05);}
#user-profile-modal .header:before {
background: -webkit-linear-gradient(top, rgba(0, 0, 0, .3), rgba(0, 0, 0, 0.5)), url("https://imgur.com/RG03PyX.png") !important;
background: linear-gradient(to bottom, rgba(0, 0, 0, .3), rgba(0, 0, 0, 0.5)), url("https://imgur.com/RG03PyX.png") !important;
content: "";position: absolute;left: 0;top: 0;width: 100%;height: 100%;z-index: -1;background-position: 50% 50%;background-size: cover !important;-webkit-filter: blur(3px);-webkit-transform: scale(1.1);transform: scale(1.1);}
I try diffrent things (color:transparent,transparency: true, rgba(0,0,0,0.1), visibility: hidden, opacity:0.5, make a transparent background and some other but none of them work.
I hope you can find a solution for my problem.
Sadly you can't.
This is because of the way Electron (the framework that Discord uses on desktop) works, the window you show content on needs to have a color. If you make it transparent, it will just fallback to white.
There are countermeasures for this, mainly shaders that copy what is behind the window and reflect it on it, but they use up a lot of computing (and they're also very overkill for one of your first programs).
Still, if anybody want to check it out:
electron-acrylic-window
window-vibrancy for Tauri (not Electron, won't work on Discord)
This is most definitely possible. Use BetterDiscord, then find someone elses theme that is modifiable and try to work from there. (https://imgur.com/a/Yp2mPQY here is a link as proof, of a transparent discord, over this post)
*I did not create this, here is the link to the exact theme https://betterdiscord.app/theme/Translucence . I wanted my own picture as the background so I went in and changed the url link for the image. However for a transparent background, there are probs other was to do this, but all i did was deleted characters from the img url, so it could not link to an image.
Uses no computing power at all, fast and easy, could probs setup in 5-10mins
ik super old post, but cause I saw a new response, that is not entirely correct, thought I would put this in here
color is the property for the text color in the element. background: transparent is the one you're looking for.
You would want to use background-color: rgba(255,0,0,0.3), if you wanted a transparent red, etc.
Alright So here is my CSS style sheet.
#mainheader,#content{
opacity:0.35;
text-align:center;
background-color:#000000;
border-top-style:ridge;
border-left-style:ridge;
border-right-style:ridge;
border-bottom-style:ridge;
}
And as you can see it's a box that's see through, but has a small black background making text look fuzzy. Example.
http://i.stack.imgur.com/18dOZ.png
When I take away that background color I get more clear text like this...
http://i.stack.imgur.com/ixLva.png
Alright So what i'm trying to say it what can I write to have that text above that box being very clear text and not with it's dark opacity.
If you want to use CSS3, try:
background-color: rgba(0,0,0,0.35);
instead of opacity.
http://jsfiddle.net/vsZtM/
References from W3.org about RGBA:
http://www.w3.org/TR/2003/CR-css3-color-20030514/#rgba-color
http://www.w3.org/wiki/CSS3/Color/RGBA
Instead of opacity, change background of containers with an alpha channel:
#mainheader,#content {
background: rgba(0,0,0,0.35);
}
Where last param is the opacity.
Opacity changes the opacity for the entire element, while background:rgba(0,0,0,.35) will change only the background color.
You should try using rgba instead of opacity like so:
background-color: rgba(0,0,0,0.35);
Note: this is CSS3 and will only work in IE9 and up, so for other versions you should provide a fallback like so:
background-color: #000;
background-color: rgba(0,0,0,0.35);
You can set the background-color as an rgba value, and leave off the opacity in your CSS statement. For example:
#mainheader,#content{
text-align:center;
background-color: rgba(0, 0, 0, .35);
border-top-style:ridge;
border-left-style:ridge;
border-right-style:ridge;
border-bottom-style:ridge;
}
This will let your text stay fully opaque, while your background is semi-transparent. As a note, however, this will not work in Internet Explorer 8 and below -- it will be a solid background.
The background-color of my body is #ffffff. And I have a div that I need is colored but it needs to be transparent or see through. Is it possible to do this using CSS3 or do I have to use images to achieve this?
body {
background-color: #ffffff;
}
.box {
background-color: #999999;
background-image: linear-gradient(to top, #999999 0%, #444444 100%) !important;
opacity: 0.7;
}
Update:
If you go here: http://pinesframework.org/pnotify/#demos-simple and look for the demo for Transparent Success you can see how the pop-up looks see through on a white background. I need to do something like that without using an image as they are using one.
It sounds like you want an alpha transparent background color. If that's the case, you can use RGBA colors, rather than a solid hex value and an opacity property. This way, only the background will have transparency, not the content.
In your case it would be:
.box {
background-color: rgba(255,0,0,0.7);
}
You can also specify a fallback color to browsers that don't support RGBA (IE 8 and older), or create a PNG image with the color fill you want. My vote is toward progressive enhancement, and just specify an alternate color for browsers that don't understand RGBA:
.box {
background-color: #ff4c4c;
background-color: rgba(255,0,0,0.7);
}
UPDATED: Per your comment below, this question appears to be a duplicate of CSS - Opaque text on low opacity div?.
You need to change the opacity of the background instead of the element:
.box {
rgba(255,0,0,0.6);
}
Or, since you are using a gradient, I would use this:
Ultimate CSS Gradient Generator
It will allow you to do semi-transparent backgrounds with a gradient.
<style>
* {
background: red;
}
.blackbalk{
background:black;
ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=85)";
filter:alpha(opacity=85);
-khtml-opacity:.85;
-moz-opacity:.85;
opacity:.85;
width: 985px;
margin: 0 auto;
height:255px;
color: white;
}
</style>
<div class="blackbalk">Text </div>
Now my text gets pink, why?
How can i get it white again?
Greetings
Edit: JS Fiddle to make it clear: http://jsfiddle.net/WFxbH/
You can do it by instead using an rgba background on your element:
Live Demo - this will work "in every browser you care about", and my jsFiddle includes the recommended IE conditional comment to make it also work in that browser.
.blackbalk {
/* Fallback for web browsers that doesn't support RGBa */
background: rgb(0, 0, 0);
/* RGBa with 0.6 opacity */
background: rgba(0, 0, 0, 0.85);
/* For IE 5.5 - 7*/
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#D8000000, endColorstr=#D8000000);
/* For IE 8*/
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#D8000000, endColorstr=#D8000000)";
}
Thew, opacity affects the entire element and its contents, not just the background color. If you just want the background color to be 85% black, you should specifiy it with an RGBA color, like so:
.blackbalk {
background: rgba(0, 0, 0, 0.85);
width: 985px;
margin: 0 auto;
height: 255px;
color: white;
}
EDIT: cant over ride the cascading of opacity. Best alternative in my pinion is to use a single pixel 85% opacity black png as the background image. option 2 would be to make the inner content actually outside of the div then position it over but that's a lot finickier. You can even get the transparent png to work in IE without much trouble.
IGNORE:Not positive, as I can't test it right now but I assume the text is becoming translucent with the opacity change. Perhaps if you put your text inside a span with background-color:none and color:white; it might work it out. May have to set the spans opacity to 100% to override.
How can I create a menu which only its background is transparent? The text should keep opaque (opacity: 1)
If I set
li:hover {
opacity: 0.5
}
The whole list item becomes transparent. How do I fix that?
There is a new value in CSS3 called "rgba" that allows you to use a transparent color as a background color. For instance:
li:hover {
background-color: rgba(255, 255, 255, 0.5);
}
I'm fairly sure that should work, though I just wrote the code on the spot so it may not. This will, however, give your menu a white-ish tinge to it. If you want to read more about RGBA, though, go here: http://css-tricks.com/rgba-browser-support/
You’ll need to use either a transparent PNG image, or an rgba colour value, for the <li>’s background, e.g.:
li:hover {
background-color: rgba(0, 0, 0, 0.5);
}
Or:
li:hover {
background: url(a-nice-semi-transparent-png-image.png);
/* Supplying just the image file here will make the browser repeat the image
file vertically and horizontally, thus taking up all the space, just like a
colour would */
}
I don't think, that's possible, try this example: http://jsfiddle.net/578SV/
You can't. The transparency level gets handed down to all child elements.
Your options:
Place another element on top of the li, possibly using position: absolute, that has a normal opacity setting
Use a PNG file with Alpha transparency to create the opacity effect (Will need workarounds to work in IE6)
Use the new rgba colour property as shown by #hatkirby, if you can live with the incomplete browser support