I want to add animation to the button with the following code https://codepen.io/chrisota/pen/bNdRaM
but altered it a bit like this
a::before{
position: absolute;
top: 0;
bottom: 0;
margin: auto;
content:'';
border-radius: 50%;
display: block;
width: 30px*2;
height: 20px*2;
line-height: 30px*2;
left: -30px/2;
text-align: center;
transition: box-shadow 0.5s ease-out;
z-index: -1;
}
a:hover{
color: #fff;}
a:hover::before{
box-shadow:inset 0 0 0 $width rgba($button-color,1);
}
However,as far as I know absolute position is better not to use, but when I delete it, the button vanishes
<row>
<div class='col-5'>
a(href="http://www.dribbble.com/chrisota" title="Chris Ota Dribbble") <i class="fa fa-dribbble"></i> Dribbble
</div>
</row>
position: absolute is a wonderful tool when wielded properly.
It truly shines in the ::before and ::after psuedo-elements.
When you set the position of the element to relative and the position of ::before and ::after to absolute, you can position your pseudo-elements relative to the element itself.
This allows you to do cool things like adding icons to your buttons for example.
Just make sure to set the display and content properties like below. You can add the top, right, bottom, and left properties to move the element around.
.some-class {
position: relative;
}
.some-class::before {
position: absolute;
display: block;
content: '';
top: 10px; /* just an example */
left: 10px; /* just an example */
width: 32px; /* just an example */
height: 32px; /* just an example */
}
on this site, there is a line underneath "Marketing Agency Fremantle".
I have used Chrome Code Inspector but cannot find what is causing this.
I want to remove the line. Thanks.
the :after pseudo element for h2 is causing the underline.
It's this CSS rule:
body.home h2::after {
content: '';
width: 60px;
height: 1px;
background-color: #4a2e69;
position: absolute;
bottom: -5px;
margin: 0 auto;
left: 0;
right: 0;
}
You can erase it or (if you can't do that) add the following to set height to 0 and make it invisible that way:
body.home h2::after {
height: 1px !important;
}
There is :after in your h2 tag
On every other browser the webpage looks fine except Firefox. Even Internet Explorer! The pseudo elements float all over the document or even aren't displayed after the first ones are. Is there any solution of this behaviour?
CSS
span[property="dc:date dc:created"]::before{
position: absolute;
top: 60px;
content: '';
display: block;
background-color: #005691;
width: 60px;
height: 20px;
}
span[property="dc:date dc:created"]::after{
position: absolute;
top: 60px;
right: 0;
width: 0px;
height: 0px;
border-top: 20px solid #01416F;
border-right: 20px solid rgba(0, 0, 0, 0);
content: '';
}
http://jsfiddle.net/LRnCM/1/
You needed to position the absolutely positioned pseudo elements relative to the parent element. Also, inline-block was added to contain the parent element's width.
.submitted {
position:relative;
display:inline-block;
}
UPDATED EXAMPLE
First time really using the pseudo :after selector. Not sure if the problem I'm running into is a limitation of it or I'm just missing something obvious.
Here's my live code.
li.current:after {
border-width: 1px 1px 0 0;
content: ' ';
background: #256f9e;
display: block;
height: 13px;
position: absolute;
width: 10px;
top: 6;
margin:0px auto;
z-index: 99;
transform: rotate(-224deg);
-webkit-transform: rotate(-224deg);
-moz-transform: rotate(-224deg);
-ms-transform: rotate(-224deg);
-o-transform: rotate(-224deg);
transform-origin: 50% 50%;
-webkit-transform-origin: 50% 50%;
-moz-transform-origin: 50% 50%;
-ms-transform-origin: 50% 50%;
-o-transform-origin: 50% 50%;
text-align: center;
float: center;
}
I've created a little triangle (Or rather a box that has been rotated to look like a triangle). I want it centered within the <li></li> but can't figure it out using my normal methods.
The things that have failed (in no particular order):
text-align: center;
float: center;
margin: 0 auto;
margin-right: 0;
margin-left: 0;
What am I missing? I doubt it matters, but I'm using AngularJS. Thought I'd mention it in case there is a known conflict between Angular & Pseudo selectors (which I doubt).
Thanks.
The issue is your use of absolute positioning & the method you're using to try and center it. If you position an element absolutely, the ol' margin: 0 auto; method won't work to center the thing. I point you to an explanation as to why this is at the end of the question, but in case you just want this to work let's get to the solution first.
Here's some working code. View it on JSFiddle
#tool-menu li {
...
position: relative;
}
li.current:after {
...
position: absolute;
width: 10px;
top: 6;
left: 50%;
margin-left: -5px;
}
Let's break down what's going on here.
Setting up a new Containing Block
In your original Fiddle, the pseudoelement is positioned absolutely relative to the viewport. An example might be the best way to show what this means, and why we don't want this. Consider setting it to top: 0. This would keep it latched to the top of the browser window (or, in this case, the JSFiddle frame), rather than the parent (the li). So, if our menu happened to be at the bottom of the page, or even moving around, the pseudoelement would be floating independent from it, stuck to the top of the page.
This is the default behavior of an absolutely positioned element when you don't explicitly set the position on any parent elements. What we want is to have its position defined relative to the parent. If we do this then the pseudoelement sticks with the parent, no matter where it happens to be.
To make this happen, you need to set the parent, #tool-menu li, to be explicitly positioned (which means setting it to be anything other than position: static). If you choose to use position: relative;, it won't change the computed location of the parent on the page, and does the thing we want. So that's why I used that one.
In technical terms, what we're doing here is creating a new containing block for the child.
Positioning the Pseudoelement
Now that our absolute positioning will be determined in relation to the parent, we can take advantage of the fact that we can use percentages to define where to place the child. In this case, you want it centered, so I set it be left: 50%.
If you do just this, though, you'll see that this lines up the left edge of the pseudoelement at 50%. This isn't what we want – we want the center of the pseudoelement to be at the middle. And that's why I added the negative margin-left. This scoots it over a bit to line the middle up with the center of the parent.
And once we do that, it's centered! Brilliance!
Why didn't my margin: auto; work?
The auto value of a margin is calculated from a fairly complex algorithm. At times, it computes to 0. I know from experience that this is one such instance of that happening, though I haven't yet traced my way through the algorithm to see exactly why. If you'd like to run through it, take a look at the spec most browsers have most likely implemented.
Using calc to center
You can also use the calc function in css to center the pseudo element.
Note: This isn't supported in IE8 and below (caniuse) but you can provide a fallback for older browsers.
View it on this code pen. I'm also using MarkP's css border method to draw the triangle.
li.current:after {
content: '';
display: block;
height: 0;
position: absolute;
width: 0;
overflow: hidden;
bottom: -5px;
left: calc(50% - 5px);
z-index: 2;
border-top: 5px #256f9e solid;
border-left: 5px transparent solid;
border-right: 5px transparent solid;
}
Wouldn't be better to just define the width as a percentage, make it a block element and text-align it in the center?
"float: center;" is invalid, and won't work. Mixing floated and absolute positioned elements are a sure way to get trouble with your layout as they don't really work that well togheter.
Try something like this:
li.current:after {
content: 'YOUR CONTENT';
display: block;
width: 100%;
text-align: center; }
Using margin:auto to center
As long as the element has a width declared you can use the absolute centering method.
To use this method the right and left properties must be set to 0 for margin: auto to be effective.
This method can be expanded to implement horizontal centering as well.
see link for full info:
http://www.smashingmagazine.com/2013/08/09/absolute-horizontal-vertical-centering-css/
li.current:after {
content: "";
position: absolute;
display: block;
right: 0;
bottom: -5px;
left: 0;
margin: auto;
border-width: 5px;
border-style: solid;
border-color: transparent;
border-top-color: #256f9e;
width: 200px;
height: 200px;
}
ul {
list-style-type: none;
padding: 0;
margin: 0;
}
<div>
<ul>
<li class="current"></li>
</ul>
</div>
Not directly related (have already voted up jmeas) but you may also find it easier to use the CSS border trick to make the triangle. e.g.
li.current:after {
content: '';
display: block;
height: 0;
position: absolute;
width: 0;
overflow:hidden;
bottom: 0;
left: 50%;
margin: 0 0 -5px -5px;
z-index: 99;
border-top: 5px #256f9e solid;
border-left: 5px transparent solid;
border-right: 5px transparent solid;
}
Similar tactics as to what jmeas has suggested with regards to the vertical positioning. We align to the bottom and then use a negative margin-bottom to push this out to the desired location.
With transform: translate() centering can be accomplished without a fixed size. This is because translate(<x>%) will use the (psuedo-)element's own size, while left and margin-left will use the container's size. By using these together we can therefore find the exact center-point.
tl;dr
To center vertically:
.container {
position: relative;
}
.container:after {
top: 50%;
transform: translateY(-50%);
}
To center horizontally:
.container {
position: relative;
}
.container:after {
left: 50%;
transform: translateX(-50%);
}
Full example
.container {
position: relative;
display: inline-block;
background: #4aa;
color: white;
padding: .5ex 1ex;
}
.container:after {
content: ":after";
position: absolute;
background: #a4a;
color: white;
padding: .5ex 1ex;
/* position below container */
top: 100%;
/* move right by 50% of containers width */
left: 50%;
/* move left by 50% of own width */
transform: translateX(-50%);
}
<p class="container">
Container with content
</p>
This may be the simplest way to do it:
.child_class::after{
position: absolute;
content: 'YourContentHere';
width: 100%;
text-align: center;
top: 50%;
}
the simplest way to do this -
With pesudo element :after or :before use display: inline-block;
Try something like this:
content: url(../images/no-result.png);
display: inline-block;
width: 100%;
text-align: center;
Using display: grid to center ::before
...worked nice for me. I'm using fa-Icons on this page and centered them within an element with 50% border-radius:
i {
font-size: 0.9rem;
border: 1px solid white;
border-radius: 50%;
width: 30px;
aspect-ratio: 1;
margin-inline: 5px;
}
i::before {
width: 100%;
height: 100%;
display: grid;
place-items: center;
}
This tutorial can help you to make center CSS pseudo-elements.
https://techidem.com/centering-pseudo-before-after-elements-content/
h2 {
text-align: center;
color: #181818;
padding-bottom: 20px;
margin-bottom: 35px;
border-bottom: 1px solid #eaeaea;
position: relative;
}
h2::after {
content: "";
width: 70px;
height: 4px;
background-color: #ff0000;
left: calc( 100% - ( 50% + 35px ) );
position: absolute;
display: block;
bottom: 0;
}
<h2>Most Recent Posts</h2>
You may use container queries with grid layout
element {
container-type: size;
&::after {
content: '';
position: absolute;
width: 100cqw;
height: 100cqh;
display: grid;
place-items: center;
}
}
Container queries: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Container_Queries
I personally don't really like the idea to change position attribute or do some margin manipulation. I think the easiest way is two lines of CSS:
.element::after {
/* your css */
line-height: initial;
vertical-align: initial;
}
And there is no need to touch the parent.
On my website http://goo.gl/ok43H I'd like to add the small "+" icon next to each white text box (I made a mockup of what i'm trying to achieve here: http://goo.gl/ftRpZ ) but I have no idea how to do that.
What would be your suggestions?
Many thanks,
Here is the html code:
<div class="presentation-plusbox">
<p>Expertise dans l'industrie</p>
<p>blblablabla</p>
<p>blabla</p>
</div>
and here is the css code:
.presentation-plusbox
{
width: 500px;
background-color:#FFFFFF;
padding:10px;
margin-left:25%;
color:#000000;
margin-bottom:8px;
opacity:0.95;
filter:alpha(opacity=95); /* For IE8 and earlier */
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
}
You can use the :before - http://jsfiddle.net/fgRRw/
div:before {
content: "+";
height: 30px;
width: 30px;
text-align: center;
line-height: 30px;
background: orange;
color: #fff;
display: block;
left: -30px;
position: absolute;
}
Just a note - :before is not supported in IE7 and below LINK
Define your + box as a div inside of .presentation-plusbox
Also add position: relative to .presentation-plusbox
Then apply the following css to the plus box
.plusBox {
position: absolute;
top: 20px;
left: -50px;
}
Of course, you'll need to adjust top and left to get it just right.
I haven't tried it, but that should work.
p { position: relative; }
p:after {
height: 20px;
width: 20px;
background-image: url('image.url.goes.here.jpg');
position: absolute;
top: 5px;
left: -20px;
}