Using ViewData to update CSS styles for a particular view

Recently, I came across a solution to change the CSS for the body element in a specific view using a layout. Here is what I found:

At the top of my view, I added this code snippet:

@{
    ViewData["PageId"] = "Login";
}

The corresponding CSS looks like this:

body#Login {
    padding-top: 0;
    background: #000428;
    background: -webkit-linear-gradient(to left, #004e92, #000428);
    background: linear-gradient(to left, #004e92, #000428);
}

However, when I attempted to modify the CSS for the html element as well by adding the following code, it didn't have any effect:

html#Login {
     overflow-y: auto;
}

I'm curious to understand how this mechanism works and why there cannot be any space between body and #Login.

Answer №1

If you want your CSS selector to target the body tag with an ID of Login, it should look like this:

<body id="Login">
    This is the specific element you are targeting
</body>

If the body tag does not have this ID, then your selector will not match. Here is an example that does not match:

<body>
    This element does not have the ID Login, so the CSS won't apply
</body>

You do have the option to override the styling for the body tag by adding additional code. However, remember that the order of CSS rules matters! You will need to include your additional code after the original CSS code you want to override. One way to do this is by using a section in your _Layout file to ensure that your new styles are applied after the shared CSS:

<link rel="stylesheet" href="css/master-shared-stylesheet.css">
@RenderSection("AdditionalPageCss")

In the view where you want to overwrite the master-shared-stylesheet.css, you can add something like this:

@section AdditionalPageCss {
    <style type="text/css">
        /* Your Overrides */
        body {
            overflow-y: auto;
        }
    </style>
}

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