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How to apply styling for 3rd party css framework like bootstrap

Im working on react web app which has less file for its styling. As
shown below, EnPage is a 3rd party component, which has content within
it, Actually the main element class "page-body" has some styling
issue, so I want to overwrite it with a styling fix
<div class="Banner">
<EnPage>
<div class="page">
<main class="page-body"> ...</main>
</div>
</EnPage>
</div>
when on hovering over in chrome devtools, I can see
.page-body {
padding-right : var( --page-content-screen-lg-horizontal-padding , var(--spacing-m));
padding-left : var( --page-content-screen-lg-horizontal-padding , var(--spacing-m));
}
In dev tools, if set these both attributes to 0, then it fixes styling
issue
.page-body {
padding-right : 0;
padding-left : 0;
}
Now how to do this code , like the below?
.Banner {
--page-content-screen-lg-horizontal-padding : 0;
}

Generally third parts materials generate custom classes that style your element. Normally, their classes are inyected after yours, to be sure that their styles have precedence over inherited or previously defined styles.
Things you should try:
1 - Read the documentation of the material library.
Depending on the material library you are using, they may provide a custom way to overpass their basic styles. Some do, other don't. Please be sure to check their documentation to see if this is the case.This is always the best option as you are ensuring the material will work as designed and will not cause any bugs or conflicts.
2 - Give an id to your element and place your custom styles on the id.
This works because CSS styles are defined based on specificty precedence. As ids are more specific than classes, these styles have priority over the ones defined by classes.
Example:
html:
<main class="page-body" id="page-body"> ...</main>
css:
#page-body {
padding-right: 0;
padding-left: 0;
}
3 - If nothing else seems to work and you really need to replace the material style, you could use !important. But please note that this is a bad practice and many state that !important really shouldn't exist in the first place, as if your need to use it is because you are not understanding css precedences rules and you are just hacking the css logics.
Putting this duscission aside, you may place !important after your declaration and this is going to enforce your rule over any other that might exist.
Example:
.page-body {
padding-right: 0 !important;
padding-left: 0 !important;
}
Did I mention this is a bad idea?
If you want to read more about css precedence:
What is the order of precedence for CSS?
https://css-tricks.com/precedence-css-order-css-matters/

jQuery - disable :not selector CSS

There's a certain CSS property that I want to remove, but I can't because it is auto-generated by a backend engine called Pelican.
.rendered_html ul:not(.list-inline) {
padding-left: 2em;
}
I want to remove this property, but I don't know how. Here's the screenshot
In a Chrome developer tool, if I uncheck that property, it works fine, but if I leave it as it is, it looks bad. And the thing I don't understand is that both appear as greyed out in chrome developer tool, and yet they seem to have effects on the CSS property. To my understanding, if the properties are greyed out, they should not have any effects, but in this case they do.
I tried doing this:
.rendered_html ul:not(.list-inline) {
padding-left: unset !important;
}
But this is not what I want because I want it, because I also want to add this property:
ul.ascii {
padding: 1rem;
}
Unsetting the padding by adding additional CSS codes in my .css file will prevent me from applying padding: 1rem property.
How can I nullify the css proprety of .rendered_html ul:not(.list-inline) ?

not ideal, but
.rendered_html ul:not(.list-inline) {
padding-left: 0 !important;
}
.rendered_html ul.ascii {
padding: 1rem !important;
}
will likely solve your problem.
the adding of the extra step .rendered_html on the second instruction gives it the same specificity hierarchy as the first one, so it wont be ignored.
you might not need !important depending on .css loading order, so try to change that too.
https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity

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.

css hover override using only css and JS

I have a code that i can only edit the CSS and the JS. The problem is that the page loads a default css that cannot be altered but you can run an alternative css and JS to add content to a page and modify the css. So i guess the css that is loaded overrides the default one. But the problem is that you can't just say
a:hover {
background-color: red;
}
You would have to reset background color with none and add underline and stuff.
so how can i tell my css to put my *:hover important over any else and remove the default hover?

The css may be too nested. Adding an !important tag would help. But it's more semantic to follow the train of elements. Right click the element you want to style. When you're looking at the editor, you'll see the specificity on the right side (where the css is) and then you can copy the selector they have. Using this selector should allow you to overwrite any styles necessary.
Far top right of the image. The .container is the overall class used here. In some cases you may see something like. (From Foundation)
.top-bar-section li:not(.form) a:not(.button)

Add following in your CSS and make sure you load it after default CSS.
a:hover {
background-color: NONE !important;
}
Using Javascript
$('body').append('<style>a:hover { background-color: none !important; }</style>');

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.