adifederico

ah now I see.  The checkbox is very light.   Thank you so much!  

Oh no! This was perfect and what will happen to all the sections I saved ready for reuse?

Unbelievable! That's so confusing!
 

Earlier today 12/1/2022 I had some option in my add section area and in my section edit options to save and reuse sections. I used it a bit this morning and it was nice but now its gone. Where did it go?

I have talked to Squarespace and they say I may have been temporarily able to access a new feature they are not ready to roll out. So, as nice as this feature was. I only got to use it for about 3 hours. But it worked very well for reusing sections.
 

Also, color will only change the text color.  You will have to use background-color if you want to change the button color itself.
.sqs-block-button:hover {
  background-color: red !important;
}
 

Try using the !important rule. It will override all other CSS specificity selectors.
.sqs-block-button:hover {
  color: red !important;
}
a:hover {
  color:red !important;
}
 

@media (max-width: 640px) { .sqs-layout .sqs-col-12 [class*=sqs-col] { float: left !important; width: 50% !important; } } This is one approach to achieve what you want.

Give this code a try. You can change the color hex to whatever color you want. Same with size. You can up the rem if you want.
.eventitem-title {
    color: #515151 !important;
}
.eventitem-meta-item {
    font-size: 1.2rem;
}

Give this code a try.   .image-overlay {
    background-color: rgba(255, 255, 255, 0) !important;
}

It looks like you want exactly his button, why not use the code provided by Ghost Plugins:
https://www.ghostplugins.com/steps/go-arrow-button-style

You will need to use the pseudo  class with some custom CSS to achieve this. 
a.sqs-button-element--primary::after {
    content: '\2192';
    padding-left: 10px;
}

@heffalump Add this to the Custom CSS on your website and adjust the colour hex codes:
.newsletter-block .newsletter-form-field-wrapper .field-error { background: #000000; color: #ffffff; } Hope that helps!

Worked like a charm! Thank you so much!!

Give this code a try. You can change the color hex to whatever color you want. Same with size. You can up the rem if you want.
.eventitem-title {
    color: #515151 !important;
}
.eventitem-meta-item {
    font-size: 1.2rem;
}

Give this code a try. You can change the color hex to whatever color you want. Same with size. You can up the rem if you want.
.eventitem-title {
    color: #515151 !important;
}
.eventitem-meta-item {
    font-size: 1.2rem;
}

Hey!
Thank you, it works.

Give this code a try.   .image-overlay {
    background-color: rgba(255, 255, 255, 0) !important;
}

@media screen and (max-width: 767px) and (orientation: portrait){
h2 {
    font-size: 1.1rem;
}
}
Sorry. Thats the correct code here.

Thanks for the code, @adifederico! I'd actually like the text to remain large and on multiple lines for mobile. The text becomes way too small to keep it all on one line for mobile. So that's the issue I'm having—I don't know how to just extend the highlight and center the text for the line break on mobile.

You can try
@media only screen and (max-width: 767px) { #block-yui_3_17_2_1_1665061046438_38782 .slide.sqs-gallery-design-grid-slide:nth-child(1) { display: none; } } Let me know how it works on your site
Support me by pressing 👍  or marking as solution if this useful for you

Give this a try. This will add padding to the top and bottom of the name. If you wish to increase the space just up the 10px.
div.healcode.appointments .trainer-label {
    padding: 10px 0;
}

Thanks, I was just overthinking it a little, Your snip was missing '}}'...

This works great.

/* Mobile resize code block */
@media screen and (max-width:767px) {
div#block-62452260eb439022d3cd {
    width: 50%;
}
}

Thanks 

THANKS! This worked 🙂

Give this a try. This will add padding to the top and bottom of the name. If you wish to increase the space just up the 10px.
div.healcode.appointments .trainer-label {
    padding: 10px 0;
}