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Change auto generated CSS dynamically

Could you tell me how can I change the css dynamically? Here the problem is, the css has been generated by the framework itself. So I cannot declare or change it.
This is at runtime:
I need to pick swiper-pagination-bullets class and need to give bottom value conditionally. Like so:
Note: this is just pseudo:
If="data!=null" {
.swiper-pagination-bullets {
bottom: 190px !important;
}
}
else{
.swiper-pagination-bullets {
bottom: 150px !important;
}
}

Just like #Duannx mentioned in the comments, you could conditionally add a class in the ion-slides element, and then apply the css style rule to the pager based on that class.
<ion-slides pager="true" [class.with-data]="data" ...>
<ion-slide *ngFor="...">
<!-- ... -->
</ion-slide>
</ion-slides>
You'd need to change [class.with-data]="data" and replace it by the real property from your component, but then you could use it in the SCSS file to change the styles of the pager:
ion-slides.with-data .swiper-pagination-bullets {
bottom: 190px !important;
}
ion-slides:not(.with-data) .swiper-pagination-bullets {
bottom: 150px !important;
}

Instead of changing CSS dynamically, it would be better to override it instead by dynamically injecting a stylesheet into the page at runtime.
const style = document.createElement('style');
const bottom = condition ? 190 : 150;
style.insertRule(`.swiper-pagination-bullets { bottom: ${bottom}px; }`, 1);
document.head.appendChild(style);
I'd try to avoid using !important. If you inject a stylesheet in the manner shown above, it will already take precedence over the existing style due to it appearing later on the page, assuming the same selector specificity.
Or else you can try to artificially increase the specificity by doing .swiper-pagination-bullets.swiper-pagination-bullets (repeat as you deem fit). If that fails to work, then use !important.
Code for stylesheet injection taken from here.

Add more elements in CSS style

I am trying to develop something where I need this requirement, I tried a couple of things, but not able to do it.
There is one style - A:
.someClass {
padding-right:10px;
}
now I want to add margin also in same class like - B:
.someClass {
margin-left:10px;
}
Now I need both, padding and margin. The thing is I can't modify A as it set by some third party JS, which doesn't reside locally.
So, is there any way I can achieve this by Pure CSS or JS (NO Jquery)

There is one style - A:
.someClass {
padding-right: 10px;
}
No, that is not a "style". That is a "rule". It says to apply padding-right to elements with the someClass class.
Now you add another rule:
.someClass {
margin-left: 10px;
}
That says to apply margin-left to elements with the someClass class.
Together the two rules do exactly what you want. The key point is that CSS will apply all rules whose "selectors" (here, the .someClass part) match the element in question. If the two rules contain the same properties, then there are ways (involving concepts such as "precedence" and "specificity") in which CSS will choose which one to apply, but that is not the case here, so both padding-right and margin-left will be applied to elements with the someClass class.

You can put both margin and padding into the element at once:
.someClass{
margin: 10px;
padding: 10px;
}
Also if the margin or anything else is set by like you said third party JS you can Override it in CSS by adding: !important so your code would look like this:
.someClass{
margin: 10px !important;
padding: 10px !important;
}
According to your question you need only padding to override.
Hope i understood your Question and could help.

remove the inherited CSS value?

I'm trying to remove the value of an inherited CSS property using Jquery.
.class1 #id1 div.class2 input.class-input{
border-color: #bbb3b9 #c7c1c6 #c7c1c6;
}
Anyone tell me how to remove this "border-color".
Thank.

Create a new class for example
.new_class{
border-color: #00ffdd !important;
}
!important does the trick!
Check this

You can use jQuery, but you'll have to assign a value to the border-color property. You can use transparent though:
$('.class-input').css('border-color', 'transparent');
Edit: Or you can disable the whole border:
$('.class-input').css('border', 'none');

You can either swap the on your div to change the color, or set the border color to empty using
$(".class1").css("border-color", "");
But I would recommend swapping out the class using the removeClass and addClass JQuery functions.

If you still want to keep the width of the border:
border-color: transparent;
If you want to remove the border all together
border: 0;
Edit: border: none; will give your the same result
So your jquery could look something like this:
$(".class-input").css("border","0");
However I would suggest using CSS if you don't need to make it animated. Since you raised the concern about .class1 #id1 div.class2 input.class-input.myclass (I'm assuming that's what you mean since you wouldn't be throwing a div into an input box.
You can use the CSS pseudo-selector :not
.class1 #id1 div.class2 input.class-input:not(.my-class){
border: 0;
}

The simplest way to handle this is to add another reference to give your override code a higher specificity.
.class1 #id1 div.class2 input.class-input [#MyNewID]{
border: none;
}
This removes the border for the area where you have added the ID so that if you are using this same format in other pages you can add an additional ID on the element on the page where you want the border to "disappear"
Please don't use !important this is a lazy way to override code and is not necessary 95% of the time. It will also cause you problem later when you are trying to change this if you are pushing down site wide skins.

why visibility is always setted to visible although in CSS is hidden?

I am using ShadowBox for showing media. It has some property showOverlay, which i setted to false, because dont need it.
Problem is that background is not accesible as if ShadowBox is modal dialog although Visibility in CSS is setted as hidden.
In Chrome and Mozilla it will be changed to visible and is modal. It works manually if me changing it back again to hidden.
BUT WHY it is always setted to visible in Chrome and Mozilla browsers sourcepage/css????
Here are my CSS of ShadowBox:
#sb-container {
position: fixed;
margin: 0;
padding: 0;
top: 0;
left: 0;
z-index: 999;
text-align: left;
visibility: hidden;
display: block;
}
#sb-overlay {
position: relative;
height: 100%;
width: 100%;
visibility:hidden;
}
#sb-wrapper {
position: absolute;
visibility: hidden;
width: 100px;
}
and it is what Chrome and Mozilla does! in Explorer it works!

Inline styles (the ones on element.style) have a greater "priority" over CSS styles defined in a stylesheet.
What you can do:
It's a good advice to actually avoid inline styles if possible. Style your elements with the least specificity at best. That way, they're easily overridable later on.
Note that changing styles via JS (someElement.style.someStyleHere) counts as an inline style as well.
If you are changing styles dynamically, it is better to define the styles in CSS classes, and use JS to dynamically add or remove these classes on the target elements.
If you are familiar with jQuery, the addClass and removeClass are the functions I'm referencing. Of course, you can come up with your own function that parses the element's className, and add or remove the said classes.
If avoiding inline styles isn't an option (due to some framework you use that does it that way), you can override inline styles by placing !important on your styles defined in your stylesheet. It's a bit rash, and usually used as a last resort to overthrow inline styles.

Based on your screenshot it appears that visiblity: visible is set as a style inside the style attribute on the element. The style attribute always overrides what is inside any stylesheets.

try using visibility: hidden !important;

This is a very simple and interesting concept in CSS called CSS Specificity
It defines to the browser which CSS rule to be applied in case of overriding of rules.
In your case, you have applied inline CSS style to your html elements. Since it has the highest priority, whatever your write in your external .css file will be ignored.
To avoid this, remove all inline css from your html code and try to incorporate them in the external css file you having. OR as many people already suggested, you can use the "!important" to your greatest advantage.
Hope this clears out the problem.

remove / reset inherited css from an element [duplicate]

This question already has answers here:
How to reset/remove CSS styles for a specific element or selector only
(17 answers)
Closed last month.
I know this question was asked before, but before marking it as a duplicate, I want to tell you that my situation is a little different from what I found on the internet.
I'm building and embedded script that people can put it on their sites. This script creates a div with a certain width/height and some information in it.
My problem is that some websites declare styles for div that are inherited by my div as well.
for example:
div{
background-color:red;
}
so if I don't set any background color to my div, it will show red even if I don't want that.
The only solutions I come along is to overwrite as many css proprieties, this way my div will show exactly as I want.
The problem with this solution is that there are too many css proprieties to overwrite and I want my script to be as light as it can be.
So my question is if you know another solution to my problem.
It can be in css/javascript /jQuery.
Thanks

"Resetting" styles for a specific element isn't possible, you'll have to overwrite all styles you don't want/need. If you do this with CSS directly or using JQuery to apply the styles (depends on what's easier for you, but I wouldn't recommend using JavaScript/JQuery for this, as it's completely unnecessary).
If your div is some kind of "widget" that can be included into other sites, you could try to wrap it into an iframe. This will "reset" the styles, because its content is another document, but maybe this affects how your widget works (or maybe breaks it completely) so this might not be possible in your case.

Only set the relevant / important CSS properties.
Example (only change the attributes which may cause your div to look completely different):
background: #FFF;
border: none;
color: #000;
display: block;
font: initial;
height: auto;
letter-spacing: normal;
line-height: normal;
margin: 0;
padding: 0;
text-transform: none;
visibility: visible;
width: auto;
word-spacing: normal;
z-index: auto;
Choose a very specific selector, such as div#donttouchme, <div id="donttouchme"></div>. Additionally, you can add `!important before every semicolon in the declaration. Your customers are deliberately trying to mess up your lay-out when this option fails.

You could try overwriting the CSS and use auto
I don't think this will work with color specifically, but I ran into an issue where i had a parent property such as
.parent {
left: 0px;
}
and then I was able to just define my child with something like
.child {
left: auto;
}
and it effectively "reset" the property.

Technically what you are looking for is the unset value in combination with the shorthand property all:
The unset CSS keyword resets a property to its inherited value if it inherits from its parent, and to its initial value if not. In other words, it behaves like the inherit keyword in the first case, and like the initial keyword in the second case. It can be applied to any CSS property, including the CSS shorthand all.
.customClass {
/* specific attribute */
color: unset;
}
.otherClass{
/* unset all attributes */
all: unset;
/* then set own attributes */
color: red;
}
You can use the initial value as well, this will default to the initial browser value.
.otherClass{
/* unset all attributes */
all: initial;
/* then set own attributes */
color: red;
}
As an alternative:
If possible it is probably good practice to encapsulate the class or id in a kind of namespace:
.namespace .customClass{
color: red;
}
<div class="namespace">
<div class="customClass"></div>
</div>
because of the specificity of the selector this will only influence your own classes
It is easier to accomplish this in "preprocessor scripting languages" like SASS with nesting capabilities:
.namespace{
.customClass{
color: red
}
}

Try this: Create a plain div without any style or content outside of the red div. Now you can use a loop over all styles of the plain div and assign then to your inner div to reset all styles.
Of course this doesn't work if someone assigns styles to all divs (i.e. without using a class. CSS would be div { ... }).
The usual solution for problems like this is to give your div a distinct class. That way, web designers of the sites can adjust the styling of your div to fit into the rest of the design.

As long as they are attributes like classes and ids you can remove them by javascript/jQuery class modifiers.
document.getElementById("MyElement").className = "";
There is no way to remove specific tag CSS other than overriding them (or using another element).

you may use this below option.
<style>
div:not(.no_common_style){
background-color:red;
}
</style>
now , if their any place where you do not want to apply default style you can use 'no_common_style' class as class.
ex:
<div class="no_common_style">
It will not display in red
</div>

From what I understand you want to use a div that inherits from no class but yours. As mentioned in the previous reply you cannot completely reset a div inheritance. However, what worked for me with that issue was to use another element - one that is not frequent and certainly not used in the current html page. A good example, is to use instead of then customize it to look just like your ideal would.
area { background-color : red; }

One simple approach would be to use the !important modifier in css, but this can be overridden in the same way from users.
Maybe a solution can be achieved with jquery by traversing the entire DOM to find your (re)defined classes and removing / forcing css styles.