Okay, first: don't panic. I promise I can get you there. ♥ From your description, I kind of think I know what your problem is, but I'll go through the list of steps one at a time, and you might wanna start over from the beginning, uninstalling the relevant things. I am doing them as I write up this list, since I don't have the theme installed on this laptop.
Step 4: Left-click on the new Stylish icon and choose "Manage installed styles".
Step 5: Click "Write new style".
Step 6: Give the style a name, like "DW skin" or "LJ Classic". Anything that will tell you what this style is if you need to know later.
Step 7: Where it says "Code", paste the source code I gave in the comment above.
Step 8: Where it says "Applies to", choose "URLs on the domain" and type in "dreamwidth.org". (You don't need to click "Add".)
Step 9: Where it says "Enable", check the tickybox.
Step 10: Click "Save".
Step 11: Refresh DW.
I just did these steps and now I have the blue layout from my screencaps, but in Chrome. I'm thinking you may have installed Stylish as a Tampermonkey script, which the OP says can cause the skin not to work 100%, instead of installing it directly from the link I gave you in my steps, but that's just a guess. Are you still having the problem?
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Step 1: Install Tampermonkey for Chrome.
Step 2: Install this Tampermonkey script. This script will allow you to more efficiently skin Dreamwidth through Chrome.
Step 3: Install Stylish for Chrome.
Step 4: Left-click on the new Stylish icon and choose "Manage installed styles".
Step 5: Click "Write new style".
Step 6: Give the style a name, like "DW skin" or "LJ Classic". Anything that will tell you what this style is if you need to know later.
Step 7: Where it says "Code", paste the source code I gave in the comment above.
Step 8: Where it says "Applies to", choose "URLs on the domain" and type in "dreamwidth.org". (You don't need to click "Add".)
Step 9: Where it says "Enable", check the tickybox.
Step 10: Click "Save".
Step 11: Refresh DW.
I just did these steps and now I have the blue layout from my screencaps, but in Chrome. I'm thinking you may have installed Stylish as a Tampermonkey script, which the OP says can cause the skin not to work 100%, instead of installing it directly from the link I gave you in my steps, but that's just a guess. Are you still having the problem?