theme development - White screen when attaching css to function.php

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When i attach below line code i get white screen and in console log it is getting below error my browsers are up to date

Code

body:not(.no-transition) #wrapper, .animsition-overlay {    position: relative;     opacity: 0;     -webkit-animation-fill-mode: both;
animation-fill-mode: both; }

Console log error

JQMIGRATE: Migrate is installed, version 1.4.1 jquery-migrate.min.js:2:552 Animsition: Element does not exist on page. plugins.js:428:1211 Animsition: Does not support this browser. plugins.js:428:1273

When i attach below line code i get white screen and in console log it is getting below error my browsers are up to date

Code

body:not(.no-transition) #wrapper, .animsition-overlay {    position: relative;     opacity: 0;     -webkit-animation-fill-mode: both;
animation-fill-mode: both; }

Console log error

JQMIGRATE: Migrate is installed, version 1.4.1 jquery-migrate.min.js:2:552 Animsition: Element does not exist on page. plugins.js:428:1211 Animsition: Does not support this browser. plugins.js:428:1273

• theme-development
• css
• javascript

Share Improve this question edited Dec 7, 2019 at 14:41 kero 6,32011 gold badge2525 silver badges3434 bronze badges asked Nov 26, 2019 at 15:52 udit sharmaudit sharma 1122 bronze badges

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2 Answers 2

Sorted by: Reset to default 1

"White screen" generally means there is a PHP error preventing the page from being generated. You should check your WordPress error log (wp-content/debug.log by default) for any relevant errors.

Adding CSS code would not prevent the page from loading.

Sometimes a default (if that exists) WordPress css attribute name may have a conflict with the attribute names in your css .

Try changing your css names to something different of more descriptive,

An example name that I've seen bring conflict/WSOD aka: "White Screen Of Death" in WordPress is .page

Try avoiding words like:

1. blog
2. wordpress
3. wp
4. header
5. footer

... or anything generic in your css

Hope this helps.

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