TLCDesigns

If you use Notepad or Notepadd++ you can copy all CSS code & paste there > then save it as Cascading Style Sheets file (.css)
Suppose you name it: tlc-design.css
Then you upload this Css file to Squarespace site, follow this
https://support.squarespace.com/hc/en-us/articles/205813928-Uploading-and-managing-files
then add this code to Code Injection > Header
<link rel="stylesheet" href="/s/tlc-design.css"/>  

We can disable code in edit mode without using safe mode.
You want to disable CSS code (<style> code) or script code (<script>)?

Use button block id
@media (hover: hover){ #button-block-id .sqs-button-element--primary:hover { opacity: 1; } } use this tool to find button block id. https://chrome.google.com/webstore/detail/squarespace-id-finder/igjamfnifnkmecjidfbdipieoaeghcff?hl=en

I haven't thoroughly tested this yet, but it seems to work with fluid engine:
 
.sqs-block-button-element--large, .sqs-button-element--secondary, .sqs-block-button-element { white-space: nowrap; }

Wow thanks so much TLCDesigns, this works amazing and exactly take out the 'last name' field without affecting the sign-up funciton! Much appreciated!

Hello, 
I found this article on the topic for newsletter blocks. I have not tested if it works though:
https://www.squarestylist.com/blog/newsletter-block-last-name
For form blocks, all you have to do is use the text field instead of the name field. This is what I did on my own website as well.

Site URL: https://keitofitness.com
I used a website speed test (https://tools.pingdom.com/#5fd89e0bef000000).
My score was greatly impacted by lack of gzip compression:
GRADE SUGGESTION F - 0/100 Compress components with gzip   Compression reduces response times by reducing the size of the HTTP response. Gzip is the most popular and effective compression method currently available and generally reduces the response size by about 70%. Approximately 90% of today's Internet traffic travels through browsers that claim to support gzip. I've searched for how to compress with gzip within Squarespace, but cannot find any instructions, nor anything explicitly stating that this is not possible.
Is it possible to perform gzip compression within Sqsp (as opposed to downloading & compressing the files with another program myself)?
Thank you!

On posts like this, if you solve it, can you share your solution for people who are searching for it? That's kind of the point of a forum...

Add to Design > Custom CSS
/* Cart line */ .cart-row { border-color: white !important; }  

Still this problem exists. I'm trying to style my lock screen before I take down my site to make some changes.
This is really poor from Squarespace. No ability to change any styles apart from the password input. 
I'm also not able to use the code injection workaround as I'm not on a premium plan. 
Any timeframe from when we can expect a fix?

That works!