Purple lines / Conditionnal rendering - css

Question

I have those purple lines ( as my screen bellow ).
I doing some conditionnal rendering, I'd like to know if I can remove all those purple lines.
I've heard removing all divs and adding React.Fragments might help, this what I've done so far. But the issue is still there.
If anyone could tell where the issue might come from, I'd be grateful !
the main view / Render 1
<div className="user-infos">
<h4><u> Parameters </u></h4>
{ (componentState == "edit") ?
<form >
<Render 3/>
</form>
: (componentState == "index") ?
<Render 2/>
: (componentState == "delete") ?
<React.Fragment>
<p> Are you sure you want to leave us ? </p>
<p> If yes, you have to type your email and press "confirm".</p>
<form>
<input type="text" />
<input type="submit" value="confirm email"/>
</form>
<span>
<button> Delete ur account</button>
<button> Cancel </button>
</span>
</React.Fragment>
: ""
}
</div>
Render 2
return (
<React.Fragment>
<p> Username : John </p>
<p> Timezone : London </p>
<span>
<button> Edit Profile </button>
<button> Delete account </<button>>
</span>
</React.Fragment>
Render 3
return (
<React.Fragment>
<label for="email"> Username :
<input type="text"/>
</label>
<label for="text"> Timezone :
<span>
<select
onChange={options}
<options>
</select>
</span>
</label>
<button type="submit"> Save Profile </button>
<button> Cancel </button>
</React.Fragment>
);

Answer 1

By default, chrome adds styling to your html. In the case of <p>, it adds the following css to your element.
If you want the margin to disappear, you need to set margin: 0; on your <p> element to overwrite chrome's styling.

Answer 2

The purple dash line occurs when there is available space for the elements to expand into. See here. From what I can tell from comparing flexboxes with other display types, the purple dash with purple background is specifically for space inside flexboxes (display:flex in CSS).
Would need to see your CSS to be sure, but I imagine there's justify-content: space-between telling the flexbox to evenly distribute the remaining empty space between the elements as well as flex-direction: column telling the flexbox to stack the child elements vertically.
If that's the case, you can remove justify-content: space-between and use flexbox styling to change things to how you want it to look. I found this website helpful: A Complete Guide to Flexbox